It was less about version parity with Apple and more about avoiding bugs in applications that would have mistaken a Windows 9 for a member of the 95/98/98SE family.
That's the technical excuse they come with afterwards. The fact is while Mac Os was stuck in version X (ten), Microsoft decided to make a perpetual Windows 10 version. Now that Apple moved up to 11 and now 12, Windows is moving to 11 too. That's a big "coincidence"...
But what for? Do you really think they think people will stand in a shop and say "that laptop is only at 10, I take the one at 11"? Also, if that was indeed the intention, they should've moved for 11 earlier. The technical explanation seems far more reasonable.