My aim was to promote a space for constructive and didactic engagement on the Trinity, instead of critical and adversarial debate. If you are not a Christian, you are not necessarily banned if you want to “play along”, but I’d expect that such theological conversations would sound arcane to non-Christians.
We have had threads like that before, but usually to do with scientific matters, such as Office Hours threads (e.g. John Harshman: The Phylogeny of Crocodiles). In these threads we regularly shunt off anti-evolution and creationist comments for example, which would only derail the thread. I don’t see a reason why theology, biblical studies, philosophy, etc. can’t occasionally also have a similar space.