If you're one of the top footballers in Europe, why would you start slagging off some of the top teams? He may want to go to Madrid now but could flop there like many, many others, at which point, he may need to move to one of the top teams he's allegedly been slagging.
If you're Madrid and you're trying to avoid an auction with Dortmund, as you don't want to pay what they want, what's a great way to force Dortmund's hand that you're the only option? Trying to convince Dortmund that Bellingham will only move to you and potentially getting some of the competing clubs to believe it and pull out would be a fairly useful tactic.
So where do we think the 'quotes' may have originated from? The reason Twitter is the mess it is is because of morons who assume everything they read is true and react immediately. And good news for Madrid will result in more clicks/likes/follows than good news for City, so guess what most Twitter accounts trying to build a following to monetise it will choose to spread.
I'm not sure how he fits our system, although I'd be interested to watch Pep change him and us again. I won't be bothered if we don't get him, providing he doesn't go to another PL team, as I'm sure we've many other alternative targets