It's now possible to read and post to this forum using your mastodon account! If you don't have one yet, you can make one on the TOPLAP social live coding mastodon instance.
To follow the different forum categories, just search for them in your mastodon account (you may need to click 'profiles' after searching:
Once you've followed the ones you're interested in, you should then see new posts pop up in your feed. If you reply to them there, your reply should appear on the forum post too. Magic!
Yes I get the same problem with post.lurk.org. I think that could be down to running the hometown fork of mastodon which is quite a few versions behind. It works on social.toplap.org