Math mode and greek letters are not bold in text (found place in class which causes it, but removing it might have secondary effect)

[TorkelE]

Basically, I am unable to get bold text in titles or when using \textbf{} when the characters are greek letters or math mode stuff.

A mwe: I replace the "thesis.text" file with:

\documentclass[times]{Classes/PhDThesisPSnPDF}
\usepackage{textgreek}

\begin{document}

\section*{Title with $2$ and 2 and \textsigma{} and $\tau$}
Non bold \textsigma{} \textbf{and bold \textsigma{}}\\
Non bold $\tau$ \textbf{and bold \texttau{}\\}
Non bold $2$ \textbf{and bold 2\\}

\end{document}

and the output becomes:

If I got into the "Classes/PhDThesisPSnPDF.cls" file, and find this section:

and comment out the 44th line:

Then I can restore the bold characters:

(well, not all those in the title, but I got a part there)
But the font get changed a bit.

I am not very good (at all) with LaTeX structure, but maybe this can help with figuring out what is going on, and how to fix it?