Why do you trust the descriptions of `ffmpeg -help`? What if some evil daemon [1] went into the binary and changed completely the behaviour of the flags? Do you read the source code and verify the checksums for every program you run? In the real world, good or bad, very few people care beyond a first level of trust: does it work for my current issue? great, no?, try something else.
Also, you disingenuously left out the parentheses from the quote: using a tool requires undertaking its downsides, if the downsides can be mitigated accordingly then the tool is useful. Millions of users put to good use imperfect tools daily.
ChatGPT is a stochastic parrot it doesn't even pass the sniff test, or first level of trust. Does it work? That's meaningless pretty much as everything else that ChatGPT spits out. The information contained in them is zero. If you read something ChatGPT wrote, you know exactly as much as you did before you read it. It sounds plausible and it's basically a zero day on human cognition. Be vigilant.
You linked Wikipedia: I don't trust that either. If I want to actually know something I will follow the sources and then evaluate the trustworthiness of the sources. Indeed, most of the Scottish Wikipedia being written by an American teenager who didn't speak Scottish at all very strongly parallels ChatGPT.
Let me translate: the AI might or might not be bullshitting, I have no way to know but I decide to believe in it. Why ?