[pescetom]

There is some symmetry here
with my previous post, in that I am unfamiliar with inverted minors and guessing a bit. But my 3♣ and GiB's 3♥ both seemed reasonable and coherent with the explanations. Now 3♠ was explained as some preposterous number of spades rather than an ask, so I punted 3NT which did not look unlikely anyway.
WTF (as might say an eminent contributor, now for hire) is 4♥ about?

[a_user]

Your 3NT bid was a little exuberant and now your partner is cueing its way to slam.
After all, if its got 15+ HCP and you've got 15+ HCP, it must be time to break out the Prosecco and invert the bottle over your minors.

[steve2005]

Well the mistake is the explanation of 3♣ is wrong.
Surely 3♣ is passable so it should be 11-13 hcp not 11-21
and 3♥ is essentially game forcing, unless you think you can somehow stop in 4♣
So 3♥ should be showing 14 or 15+ hcp not 10+

3NT should not be showing 15+ hcp it merely shows the 11 you have promised plus stopper in the black suits