That's very fair. As you say it's a sales pitch, so they're downplaying the negatives. They do talk about them, but the downsides they list are just a lot more serious than they suggest. I'll talk about them though!
- Unlikely to finish things, especially to a high standard
- Unpredictable, jumping between being a 10x developer and a detriment to the team for unknown reasons
- Forgetful, won't follow through on things and won't even remember it was a thing they were meant to be doing
- Generally quite susceptible to mood swings
However, I will say that many of the things that those downsides will be far more prevalent in a traditional workplace than in one that read this post and took it on board. If you're providing varied work, consistent feedback, and low expectations (in terms of quality, not volume), then you won't really see those issues arise much.