Nah.
We poached Van Persie (equivalent to Lewandowski) I'll give him that. And that's about it regarding our direct domestic rivals in the last 10-15 years. Mata was almost forced out of the club and considered surplus to needs by Mourinho. Shaw from Southampton, hardly traditional rivals. Fellaini from Everton. Ferdinand was sold because Leeds' finances were a mess. Jones was acquired from Blackburn, Smalling from Fulham, Owen on a Bosman from Newcastle, Young from Villa, Berbatov and Carrick from Spurs, Alan Smith from a struggling Leeds, Valencia from Wigan, Edwin and Saha from Fulham again, Zaha from Palace, Powell from Crewe and so forth.
Since 2000 we've forcefully bought 1 marquee player from our usual title competitors in a way that would weaken them and disrupt their ambitions moving forward. I struggle to see how we're equivalent to Bayern in that sense, who with the possible transfer of Reus would have bought 3 of the 5 most important players in as many summers windows from a side that was the closest to challenging their domestic dominance. United never plundered the likes of Arsenal during their peak seasons, or Chelsea during Mourinho's first spell, or Liverpool when they spiked up intermittently or City in recent seasons.
So I don't really agree with his insinuations on the basis of one sole transfer of Van Persie. His claims would be more apt for City who bought 3, possibly 4 good players in Nasri, Clichy, Toure, Sagna in a way that would weaken Arsenal and deplete their overall level of experience.