For the past few days it really seems LET is teaming up with Cloudflare for one big conspiracy against the Internet .....
lowendtalk.com is not accessible because direct access is either blocked entirely or after a certain number of requests. The CF protected www.lowendtalk.com on the other hand seems to be become unavailable every once in a while due to CF not being able to connect to the backend server either.
Considering it can be accessed via proxy services (which apparently are routed to different CF frontend servers) it would seem only certain CF servers are affected. Maybe you could clarify this with them. The most recent error number was
Error 522 Ray ID: 17c6135c0d730893