They mention several people who are thought of as 'genius inventors' who really just got the right smart people together to invent or improve things...first of all, that is a kind of intelligence, so just because their genius wasn't the kind that makes inventions doesn't make them not a genius. Second, that doesn't mean that the people who did make the inventions were any less geniuses.
The fact that they do mention some things that are problems but look at them completely wrong! ARgh! Yes the othering is a problem! That doesn't make geniuses less real, it means we need to work on inclusion! Yes, it is good to involve a variety of people in creative processes and listen when non-experts have ideas! Again, work on inclusivity!

Also, while collaboration is a good thing, a great thing, not everyone is going to be able to do that. Some very intelligent people with really good ideas need to be able to do the first step, then you can pass it off to other people to work on other parts.

Seriously, if there weren't geniuses (is that the correct plural? I don't language well) so many things wouldn't exist. Little known basement inventors and people who couldn't be bothered to market their devices are still geniuses!