Instead of the usual written diarrhea, he has been silent for a few days.  This is unusual.   So I asked AI if I could detect a temp ban here... I was happy with the results (bolded)

🧩 Workarounds:
If you're suspicious about a temp ban on a particular user:
Check their post history for patterns.
Ask in Meta or Reputation boards (politely) if anyone knows their status.
Use services like BPIP.org to view stats (but temp bans are not shown there either).

My question does remain though.  I wonder if it's safe to unlock a thread where he has shown he will not respect the rules.