I largely agree with the writer’s skepticism, both of the coins and of the VCs, but shouldn’t it be straightforward if time-consuming to confirm insider selling

I largely agree with the writer’s skepticism, both of the coins and of the VCs, but shouldn’t it be straightforward if time-consuming to confirm insider selling? If these are public blockchains, one ought to be able to notice and correlate big outflows from addresses with large holdings, no?