Do you think they'd really do that?
Just hype their game up and tell people lies to sell copies?
To answer your questions above - no, I don't really think they'd blatantly lie just to sell copies. The reason is twofold. First is that they have pretty much everything riding on this game. If they hit the jackpot, they will go into the hall of fame for good, Witcher 4 will be hyped even more and they will swim in cash. If they fail however, they basically are done. You can't tell people that 'it just works' when it really doesn't and expect fans to keep being your fans and buy your next product. It just doesn't work this way.
The second reason is pretty trivial and
Lord of Riva explained it pretty well.
I have my own reasons also but I'd like to keep those to myself.