I guess I am not the only one or am I? For last a few days when I try to access Bitcointalk with TOR I continue to redirected to Cloudflare human checking window. I was in the same loop for the last a few hours today too and now I had no way but to buy a VPN and posting this topic using the VPN. I am not a VPN friendly person. TOR is my trust.
Strangely i do not use tor (also no VPN) to access bitcointalk but after reading your post, i just login to check my BTT login from TOR and i faced no issue at all.
The error meessage that you shown, can sometimes come when you internet is not working well or is slow.
By the way, why it is so important to use VPN or TOR to access bitcointalk ? I got this impression from your post and i am really curiuos to know about it.