Not sure why you're being downvoted. It's certainly true that while there are many people who would not pay for the content at any price, there are also many people who would stop pirating and instead pay, if they got the right price, format, terms, etc.
But that's not what the parent is saying. They are saying that if piracy stopped dead cold, almost all pirates would just go and buy the content they were pirating. That's categorically not true, or at least not 100% true. People would probably buy stuff, but at a rate so low, the industry would be hard-pressed to notice the difference.
They didn’t say “almost all”, only that there were many people who would. That seems highly plausible given how many millions of people have pirated content: no, it wouldn’t be everyone buying everything they’ve downloaded but even a modest percentage would be a noticeable increase in sales.
There’s a widely accepted claim that Netflix entering a market correlated with piracy going down because many people are looking for something to watch at a reasonable price. The person who is looking for, say, the latest release or determined not to support certain large media companies is probably still going to hoist the Jolly Roger but that’s far from everyone.
Yes, there are always people on the edges of the spectrum. But most people who can afford it, will prefer to pay some price for the most amount of content. For a time, that service was Netflix, but it is no longer the case (not necessarily Netflix' fault).
