I don’t know. The author makes some arguments I could get entertain and get behind, but they also enumerate the immense complexity that they want web browsers to support (incl. Gopher). Whether or not Google deprecating XSLT is a “political” decision (in authors words), I don’t know that I know for sure, but I can imagine running the Chrome project and steering for more simplicity.
If you really want to improve the simplicity, there are better ways to do so rather than excluding Gopher. (Also, they could make XSLT (and many other things that are built-in) into an extension instead, therefore making the core system more simpler.)
This appears to be what they are doing, in fact!