If you think about it, City had to buy 2 teams before winning the title from when being bought.
There's the signings of Robinho, Bellamy, Wayne Bridges, Given, and a few others I can't recall who were not around / anywhere near the 1st team when we won the title in 2012.
Problem Newcastle have is they have a shit team and manager and can't do anything until January by which time being in the bottom 3 is a very good possibility...... so if you are a top player and they want to go after you in January are you going to sign for a club that quite possibly could go down?
Would Haaland leave BD and Champs League football to join a relegation battle? Or Harry Kane?
Or even a decent manager if they do sack Bruce? I bet even Big Sam would turn it down lol