...
This is not surely burning, because likely a private key exists, if Satoshi hasn't deleted all copies of his private keys. Nothing we can prove, nothing he can prove to us. All coins except the 50
BTC from the coinbase tx are technically spendable for the owner of the private key which belongs to the public key I mentioned in my previous post.
Do I believe that at one day Satoshi will move the spendable coins of the Genesis block? No, I don't think so!
Are coins sent to the Genesis block practically immobilized? Very likely, yes!
Are those coins burned? Hm, technically not, practically very likely so!
Is this a waste of coins, a contribution to UTXO set bloat? In my opinion, yes, the latter: in consequence, yes!