We had this discussion yesterday. You basically said the same thing then and I told you why I disagreed. Not sure why you are suddenly a day later quoting one of the earliest posts in the discussion, saying the excact same thing without elaborating at all.
It isn't a good deal when it became abruptly clear that we would have needed the player he became as soon as he got given a chance, rather than the fee. You saying over and over again that De Bruyne didn't cut the mustard at Chelsea doesn't make it true. They had a great player and they sold him. They made a mistake. Both De Bruyne and Palmer went on to become two of the best players in the league straight off the bench. No development time at all, not a year after the move. Straight away.
I understand that it could be seen as a good deal, or a good move at the time. But this is the highest level of a multi-billionaire industry. Decisions will be judged on their ramifications long after the fact. Cole Palmer was a major mistake by us. KdB and Salah were major mistakes by Chelsea.