Would the miscreant responsible for this like to come forward?!?

it's a 2785 byte jpeg of a dickbutt, securely embedded in 88 fake pubkeys via a bunch of p2wsh multisigs. yes, it's completely standard. yes, it gets the witness discount. no, bip444 doesn't fix this.

with this method, you can embed up to 19x32=608 witness bytes per OP_CHECKMULTISIG operation, with an overhead of just 76 bytes, plus the weight of the input itself. however these large multisigs have a high sigop cost, which means they can't fill an entire block by themselves.