As I said, the effort beyond Hanlon's Razor seems highly unlikely, and I do not see what potential reward Apple would have seen, especially considering they were going to reveal the mistake on their own.
As they apparently got the benchmarks correct, it seems they simply didn't update the tech specs correctly. Seeing as the 10 GPU core M2 already existed, this seems a fairly obvious failed "search and replace" error, versus a planned overstatement intended to impress. As per Hanlon, mistakes are much more prevalent than conspiracies.