Well, I have the proof, but they may not or can not use it. Or they are too busy.
At least NEM admins could easily check the NEM blockchain information. (In August I sent a signed message from my NEM wallet to the recovery*@bitcointalk ............. no answers yet)
I'm not sure what you need a NEM administrator for ?
But since I don't know the full story, it's difficult to form an opinion.
The last transaction from the account you used for your 1.5 stakes went out in March 2021.
Since you linked this account to your name (jkoil) in 2015, that would at least be an first indication of your identity.