I'm a little confused. She says it's not a transitive verb, but then she cites some definitions of "grow" as a transitive verb?
It's been a transitive verb for at least 200 years now, as the citations from those definitions show. She (and many others) object to this sense of "grow" not because it's transitive, but because it's a metaphorical extension of the meaning. It's pretty new, as far as I can tell, and I don't think it's British. It strikes me as American businessese, but I could be wrong.
The question "Is it wrong?" is a little more complicated. If new meanings or new words are automatically wrong, then yes. But that's a pretty extreme stance, because it means that we can never have new words or new meanings of existing words. A lot of people do dislike this use of "grow," so you might be able to consider it wrong in a democratic sense—the people have spoken, and they don't like this meaning. Of course, usage issues are never that simple and straightforward, and I'd guess that this meaning is not going to go away but is rather going to become more prevalent.
And no, you're not asking too many questions. I like answering questions like this.
Edit: Ha! It seems that goofy and I are on the same wavelength, even down to the choice of the words "metaphorical extension."