He's won a treble with only academy players before after banishing Ronaldinho, Deco and others who though he was a clueless coach.
Wouldn't say Henry and Eto'o were academy players. More importantly, the context is different. Pep didn't lose Xavi or Messi due to a long-term injury. Also, even that Barca team couldn't win 4 league titles in a row. The more trophies you win, the more difficult it is to continue to win trophies. To win 5 in a row in England or the CL without a fundamental player like Rodri after having won so many trophies in recent years would be some achievement.
This is part of the context as well:
