Latexdiff and achemso not showing changes to the title

Question

I'm trying to use the command latexdiff to provide markup on changes between two similar latex documents. I have used the achemso package and would like to continue doing so. It shows changes in the main text and figure captions but not author names, the title, nor the abstract. I provide below a mwe; old.tex is the original document and new.tex has five changes:

• Change to title (NOT SHOWN on diff.pdf)
• Change to author initial (NOT SHOWN on diff.pdf)
• Change to abstract text (NOT SHOWN on diff.pdf)
• Change to main text (markup shown)
• Change to a reference (markup shown)

To get this result I run the following bash script (see below) in the same directory containing old.tex and new.tex. The essential command for latexdiff I am using is:

latexdiff --append-context2cmd="\twocolumn,\abstract,\@twocolumnfalse,\title" old.tex new.tex > diff.tex

I had tried the --append... option after reading some other resources online, but still have not managed to get the changes shown in the resulting diff.pdf file.

Thanks in advance for your help.

Contents of old.tex:

\documentclass[journal=jacsat,manuscript=communication]{achemso}
\setkeys{acs}{articletitle = true}
% manuscript title
\title{My title}
\SectionsOn
\SectionNumbersOff
% author list
\author{A. N. Other}
\affiliation[Latex]{Latex University}
\altaffiliation{Contributed equally to this work}
\author{B. N. Other}
\affiliation[Latex]{Latex University}
\altaffiliation{Contributed equally to this work}
\email{blank@blank.com}
\usepackage[hidelinks]{hyperref} % Provide convenient links throughout
\usepackage{achemso}         % ACS formatting
\renewcommand*\titlesize{\Large}
\let\oldmaketitle\maketitle
\let\maketitle\relax
\begin{document}
\begin{filecontents}{oldrefs.bib}
    @article{ref1,
        title = {Paper Title},
        volume = {70},
        journal = {Nature},
        author = {Smith, J. H.},
        year = {1942},
        pages = {1--31},
    }
\end{filecontents}


\twocolumn[
\begin{@twocolumnfalse}
    \oldmaketitle
    \begin{abstract}
        My abstract. 
    \end{abstract}
\end{@twocolumnfalse}
]
\section*{Introduction}
Main text.\cite{ref1}
\bibliography{oldrefs}
\end{document}

Contents of new.tex:

\documentclass[journal=jacsat,manuscript=communication]{achemso}
\setkeys{acs}{articletitle = true}
% manuscript title
\title{My title has changed}
\SectionsOn
\SectionNumbersOff
% author list
\author{A. N. Other}
\affiliation[Latex]{Latex University}
\altaffiliation{Contributed equally to this work}
\author{C. N. Other}
\affiliation[Latex]{Latex University}
\altaffiliation{Contributed equally to this work}
\email{blank@blank.com}
\usepackage[hidelinks]{hyperref} % Provide convenient links throughout
\usepackage{achemso}         % ACS formatting
\renewcommand*\titlesize{\Large}
\let\oldmaketitle\maketitle
\let\maketitle\relax
\begin{document}
\begin{filecontents}{newrefs.bib}
    @article{ref1,
        title = {Paper Title},
        volume = {70},
        journal = {Nature},
        author = {Smithsonian, J. H.},
        year = {1942},
        pages = {1--31},
    }
\end{filecontents}


\twocolumn[
\begin{@twocolumnfalse}
    \oldmaketitle
    \begin{abstract}
        My abstract has some new information. 
    \end{abstract}
\end{@twocolumnfalse}
]
\section*{Introduction}
Main TEXT.\cite{ref1}
\bibliography{newrefs}
\end{document}

script for producing result (diff.tex and diff.pdf):

#!/bin/bash
latex -src -interaction=nonstopmode old.tex
bibtex old.aux
latex -src -interaction=nonstopmode old.tex
pdflatex -synctex=1 -interaction=nonstopmode old.tex
latex -src -interaction=nonstopmode new.tex
bibtex new.aux
latex -src -interaction=nonstopmode new.tex
pdflatex -synctex=1 -interaction=nonstopmode new.tex
latexdiff --append-context2cmd="\twocolumn,\abstract,@twocolumnfalse,\title" old.bbl new.bbl > diff.bbl
latexdiff --append-context2cmd="\twocolumn,\abstract,@twocolumnfalse,\title" old.tex new.tex > diff.tex
latex -src -interaction=nonstopmode diff.tex
pdflatex -synctex=1 -interaction=nonstopmode diff.tex