I got my adapter 3 days ago and tried it out right away. The charge process went flawlessly, if a tad expensive. It cost me $8.50 to charge from 73% to 80%. But it was worth it to verify that the process works. I bought the GM adapter from the app. But I’ve seen YouTube videos where Lyriq owners used both the Lectron and the A2Z with no problems.
It depends on how you define “receive”. I “received” my adapter 3 days ago, but only after I first sent GM $225 ($254 with tax). So the answer is: YES, any Cadillac owner can “receive” an adapter – after they pay for it.