You have it exactly right there. There is never a need for them to ask information for you to prove something.
Especially the keys! Any of them!
By adding they show themselves to be a shower of scamming fannies.
And yes, taking almost two hours to answer my reply. Tsk tsk!
I mean, how could people think it's official when the official channels don't even post statements about what's going on with Steemit, right? You would figure they're even less responsive when it comes to whatever the memo is offering hahaha! That already there is a telling sign that the person isn't affiliated with Steemit Inc