Our best player could also earn 350k (or higher). The point is that there should be at least something resembling logic when it comes to a player's level, what they have given to the club and what they earn. And contrary to what you believe, older players (up until a certain point) earn more than young players.
De Bruyne was the same age as Bruno when he signed his last extension, making his salary 400k. Yes, he's clearly better than Bruno but it goes to show that being 30 years old (and far less fit) and running out of time doesn't mean that you don't have any strong cards to play.
And he's hardly the only high-paid player on their payroll. Jack fecking Grealish earns 300k too. Bernardo Silva, who I would say is comparable to Bruno skill-wise, is also on 300k. He was 29 when he signed the extension.
And then we have Havertz, who earns 280k in Arsenal