Can anyone explain the theory that "they" (market makers/hedge funds/whoever) push a price down to avoid having to pay out for call options?

I heard a commentor somewhere mention it in passing, but they didn't explain it in detail.

They hypothesized that people would have calls on NVDA which went up a lot in the after hours last night, but that today "they" (market makers/hedge funds/someone?) would push the price down to avoid having to pay out for those calls.

Can someone explain this in more depth?

Also, can someone who actually worked in an institution/hedge fund/market maker verify whether they ACTUALLY do this? It sounds very odd, is it illegal? It also seems dangerous because if they think a stock should go up, and they force the price down by SELLING TONS OF SHARES, it seems like a risky gamble because what if it doesn't work and now they have even less shares.

I feel like when this idea gets brought up, it's always by people who have no experience working in the industry, so how would they actually know it happens? What if it's just a conspiracy like "oh the bad guys came and pushed down the price of my stock and that's why I lost money".

Does anyone have links to interviews or youtube videos where industry people actually say this really happens? (No offense but if a person has never worked in the industry, how would they know that this kind of stuff happens? It would be like trusting a person with no military experience to tell you about secret strategies only people deep in the military would know)