I get what you mean, and I agree it's unlikely that they actually removed the data from ME2. But remember, the PS3 version of ME2 runs on the ME3 engine and has a lot of refined stuff compared to the PC/Xbox 360. They messed around with game files quite a bit IIRC so it might be that they did physically remove some things.
For example, I've read in several places that "an entire planet" was skipped in the PS3 interactive backstory comic (story of ME1), but I can't work out what planet that is. I do know that there's missing dialogue in PS3 ME2 they'll have to either "reactivate" or "put back in".