That was the PL of 14/15, quite far from a top league and not better than La Liga of 20/21, but no matter
Kane was/is one of the best strikers of the last 30 years
Rather comparing Hojlund to Isak for example offers more promise about his future potential. Isak was a bust at Dortmund, moved to Real Sociedad were he was promising(and pretty decent) in his first season, great in the second, than then had a down year in his third, before signing for Newcastle for a price that at the time looked like a huge gamble. Though it must be said that Isak always offered a lot to his team outside of goals, he was a very complete forward and the closest thing to Benzema from a technical viewpoint
Hojlund was a 20 year old coming off 6 good months with a team and manager who've spent the last decade making forwards(and wingbacks) look like beasts, with very clear holes in his game he'd need to improve to become more than a 6 months wonder at Atalanta. He was a project of a top striker and it never made any sense that United signed him back then, for that money, to immediately ask him to lead the line
Add to that the fact most of his success in Italy was owed, besides a team that basically always makes forwards successfull, to having a significant physical advantage over most defenders
The worrying thing is that, after showing some positive signs in the second half of last season, he looks to be regressing now