This assumption is disproved every day by publicly available short interest data. If you operate on the assumption that all official data is false you can make all the wild claims you want, but you're not being serious and your theory is unfalsifiable.
It's entirely falsifiable in multiple ways: (1) a voluntary share recall triggered by GameStop would force an accurate share count; (2) an extraordinary action triggered by shareholders for a formal accounting; (3) a special dividend with no equivalent cash value (eg NFT); or (4) a majority of shares getting direct registered (DRS) with the company's transfer agent (ComputerShare) rather than through brokerages so that the unique market maker powers at the Depository Trust Company (DTC) cannot mask the underlying share count.
I will also say: you can read SEC sources about RegSHO limitations about how short interest can be manipulated and masked through "Failures to Deliver" (FTD). So this is not exactly an assumption, more of a preposition about magnitude.
> If you operate on the assumption that all official data is false
This is a strawman. It is possible to believe (and there is motive and opportunity in this case) that one "official" statistic is manipulated or does not show the whole picture without being a raving conspiracy theorist who trusts no official.
This assumption is disproved every day by publicly available short interest data. If you operate on the assumption that all official data is false you can make all the wild claims you want, but you're not being serious and your theory is unfalsifiable.