Here's a Youtube clip elaborating on the same thesis:
The fellow argues that there's been a dramatic increase in homogenization/sameness of pop music these days across both specific artists' catalogues as well as across artists. There's been a dramatic decrease in timbral diversity in pop music over the last fifty+ years. Moreover present day pop hits all tend to feature the "millennial whoop" sound pattern which is not at all surprising since the majority of pop hits these days are written by one of two fellows, Max Martin or Lukasz Gottwald.
