I think you bring a great point, creativity, ideation and making good decisions. More people means more ideas being bounced around, that could lead any one person to a solution which would have not happened otherwise.
But I think there's a cap to that as well, if you bring 10 people do they get over the 10 foot wall faster than 2 people would?
No they probably don't.
So from 1 to 2 you've got great added productivity, but at 10 you're majorly wasting resources.
That's where the other advice would kick in, getting over that wall won't get any faster, you can't scale beyond a point, unless you use other strategies:
1. Build better tools/frameworks, like say have a team build a ladder, now 1 person can get over the wall as fast as 2 people could prior.
2. Diversify your offering, have the other 8 work on other stuff that don't depend on getting over this wall.
I think that's all the ones mentioned on the article, but it be interesting to see if there could be more?
Now, maybe it takes 10 people to think about the problem of how to get over the 10 foot wall repeatedly and efficiently, at lower cost, for example to invent a ladder assuming ladder's didn't exist. I'll give you that, this is an interesting take.
But did it really take 10 people, or it's more that only 1 out of 10 people will come up with this great solution? And if so, you could find yourself adding 100 people with no one thinking of the solution and a competitor with only a single person might think of building a ladder. So what's the takeaway for scaling here?