[whynotmaybe]

Especially the fact that the issue is already resolved and "waiting" for release.

IMHO, asking for the next release date is ok. He even added sorta justification as to "why" he asked it.

Proposing consultancy services is also ok, just like answering "we don't have a release date" would also be ok.

But the email... Can't choose between this guy thinks he is "The Guy Working At IBM", or he sucks at communicating.