If you won't, then don't mention it. It comes across extremely rude and arrogant ("oh yeah I think I know a way to help you, but no I won't.")

He is signalling that he has connections. One day we could be as cool as this guy.

No, it's because I used them once for a former employer issue (after a Yahoo! employee referred me ~2 years ago for that specific thing).

Knowing that the program exists should be sufficient for anyone who needs this to find access, though. Hint: google the fucking string I quoted. But I'm not putting in any effort beyond communicating that fact for some random, hostile person on a website, no.

The information might be useful nevertheless.