US Gov Selling their BTC. How possible is that they are doing this?

Tinfoil hat time.

With US government selling batches of their stolen BTC every now and then.

What if they wanted to do the following:

Sell 10,000 BTC on coin base, causing a dip in price because of the sudden offer spike.

Rebuy 10,000 OTC so price doesn’t go up. This will be more expensive for them but who cares? They have the printer so dollars will never run out for them.

Repeat their process on and on, of selling huge amounts of BTC on exchanges and re buying it Over The Counter to cause price dips when selling but preventing the price to go up when buying.

Technically they can do this forever preventing the price of BTC to go up and killing its interest? Is there something I’m missing?