It is one explanation, however, I don't see very much evidence that it is the correct one. It might be partially correct or totally incorrect. Maybe it's fully correct? I don't know, but I have a few wallet addresses and not one of them have any withdrawals showing up on the Block Explorer for the respective coins.

Edit: "ACCO,likes,Sigt,mgn,castle,GIRO,URALS,YTN,VAL,SWEEP,Matrix are enabled for withdraw , More coins will follow ."

More Shitcoins opened up, still none of my Shitcoins, but I've resigned myself to their loss.