Technically yes, but there are caveats to this. Drug companies regularly create new variants with no distinguishing characteristics but which reset the patent clock, using litigation, trademarks, secrets, and other tactics to prevent the original variants being used.

That’s the freedom-to-operate side. But “Patent hell” could also be the lack of clear IP that would allow a commercializer to capture a return on developing this. Not much incentive to spend tens of millions on trials if at the of the process the product can be sold by anyone.

So a patent that predates their work could, at most, frustrate them for 20 years, or two decades. I have no idea who these guys are or what patents they're referring to, but the use of the word "decades" here is not obviously deceptive.