https://www.chiark.greenend.org.uk/~sgtatham/putty/
Exactly. Which nicely confirms all this by saying:
Latest news
2025-08-14 New website, putty.software
We have a new domain name for the PuTTY website!
...
What if someone hacked his site and inserted that news item? Better to visit the guy in person and verify.
What if someone planted the idea of adding a new website for the project while he was asleep?
Which is what the original response linked to. :P