He's forwarding to Simon Tatham's page and always have; he's not providing mirrored executables.
The domain owner knows what people are coming for, and has forwarded to the right page for more than two decades.
I see that it may be a cause for concern because of our consciousness about software supply chains we have today.
But the domain owner of putty.org provides his own unorthodox but reliable service to the online community.
On the other hand, putty.net is just for sale. Which application is more moral here?