So the testflight link changed, see the pull request with the new link here (the one in green), just tested and it works great:
https://github.com/mormaer/Mlem/pull/257/commits/ba8c1bfd58e99b6c9c28cb5929a205629b541c7b

Update TestFlight link in README by MrAusnadian · Pull Request #257 · mormaer/Mlem
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GitHubYeah he seems incredibly bitter.
One thought is that awards etc for certain comments push in to the top when sorting by hot, I believe. Just a guess though.