Deprecated code has been patched.
i.e phab:T347127, phab:T304760.
It seems like we've ended up in a situation in which a Phabricator project was created despite Phabricator not serving as the canonical issue tracker, which seems unideal and almost led me to mark this as unmaintained when I found it in Category:ParserFetchTemplate extensions
I'm the maintainer and there are no other issue trackers. I'll get to it (as there are other upgrades I want to make).
Can I tag you on gerrit for code review ?
I don't have the right to merge patches anywhere, but sure I'm willing to look at some.
(I'm not actually running this extension anywhere, just trying to make MediaWiki.org look more up to date by cleaning Category:Extensions using removed hooks)
Thanks for doing that underlooked but nonetheless very important task ;)
I'll let you know when patches are up for review.