I mean in literal terms like that it won't help, but selling a massive load in order to create speculation that coerces others to sell as well may drop the market far enough to allow a profitable venture.
It's a complicated and risky scenario that must play out in order to make money.
1. Sell massive amounts at low prices.
2. Hope that people sell after you are done selling and drive prices even lower. (uncertain)
3. Buy back massive amounts without raising the price. (unlikely)
4. Hope that people buy after you are done buying and restore prices to normal. (uncertain)
It might work in the movies, but it is unlikely to work in reality.