Doubtful. Rumor is MS already had their hardware team working on early Scarlett prototypes as soon as they finished work on Scorpio (XB1 X) back in 2017. I doubt they would let themselves fall that far behind.
It’s not unheard of for MS and Sony to play these sorts of spec guessing games with one another. Leakers and developers thought PS4 only had 4GB of RAM right up until it was announced, because Sony decided on 8GB at the last minute.
All big 3 start working on their next console when they launch the current one. That doesn't prevent HW to be delayed though.
Sony didn't play spec guessing. They ramped up RAM very late because of price reduction on RAM, and only a few internal devs were informed of it.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."