He's started more games for us than any other player in the squad, bar Rodri.Come on, he's not made of glass. I don't know where this idea comes from that he will get injured if he plays 60 minutes every now and again.
That's pretty impressive for a player that at 22 is already stacking up his list of minor injuries (https://www.transfermarkt.co.uk/erling-haaland/verletzungen/spieler/418560) - These lists are far from perfect, but that's a lot to have by 22.
He tends not to be taken off until he's scored, or the game is under control, and this season is almost certain to be the most minutes he's ever played, so it makes absolute sense.
We have potentially 14 games left, and it wouldn't surprise me if he started 12, and it's possible he starts every single one. Makes absolute sense to take him off as soon as the games are safe, rather than make him play unnecessary extra minutes.