They've done some good business, annoyingly nobody seems to be putting up proper competition for their targets, so this rebuild is going to get done faster than it might have done otherwise. Saying that though, they started it last season and although they got good prices, they aren't Robertson or even Salah levels of bargain finds. Their squad cost must be racking up.
Before long, just like the term 'net spend' has disappeared from the PL fans consciousness, we'll stop seeing squad cost comparisons too.