Someone who steals 10,000 Bitcoins isn't going to pay only 3.42 sat/vbyte in transaction fees. They'll pay much more to make sure it confirms in the next block.
Although I too don't think it was stolen, you're wrong.
nSequence = 0xFFFFFFFE, so no RBF, so nothing the owner could do once the tx is broadcasted.
doesn't matter if it gets mined in a block or two, or 20.