Well, to do the exact same trade, they would need to place the trades at the same time. What they are doing is coming late to the party. Like these altcoin telegram channels, by the time the operators say it's still pumping, they have already placed the sell orders.

But this could have another cascading effect, if the tiktokers followers do the same after them, the price might go up in the cryptocoin space, but not on the stock market.