Knowledge base feedback.memrise.com’s server IP address could not be found

I’d try to look up some articles in the Memrise Knowledge Base at feedback.memrise.com, but I get the message that the IP address could not be found:
feedback.memrise.com’s server IP address could not be found.
Is this temporary? Or am I uninformed and this knowledge base has been moved?

For example, this post mentions quite a number of links: Understanding Memrise

Hi John,

The IP address may have changed when they updated the Knowledge Base some time ago.

You should still be able to get there either from this forum by clicking on Basic%20%20%20Memrise in the top bar and then “FAQ”; or from the “FAQ & Help” link that is at the foot of most pages in the Memrise learning site.

I’ll flag this up in that other post of mine that you referenced.