Finally got around to clean up the RSS feeds on my site. You should now be able to subscribe to individual feeds or the complete firehose at /posts.
Individual post categories now have their own RSS / HTML feeds:
https://bascht.com/posts/pixelfed/
The fix was rather easy since all posts do have their own type: https://git.bascht.space/bascht/bascht.com/commit/5ceeab47a5c3da420e74b7a65c5646159900429f