He hasn't provided a citation. He's told someone they can do their own research an a mailing list. A parallel might be me claiming that we have a highly algorithm for factoring large primes and saying you can look it up on arxiv.org - I've pointed at a repository of knowledge, but not actually cited why I believe the fact.

Providing a citation is pointing at a specific place where the information came from at the smallest granular level. In this case, a citation would be something like links to specific threads.

Hyperlinks were invented for a reason.

How can you trust the mailing lost when the accused are the heavy-handed moderators of that list?