I have the same problem, and honestly I can just about force the thin side of the floss between my teeth but it’ll get stuck sometimes (as the tight part is the top of the tooth), which is just not great.
The brushes, which I was excited for and bought the smallest size of, will only fit under the problem area - and are uncomfy.
So I use them to clean electronics 😅
I suspect he means less “too much experience” and more “not wanting to pay his desired salary”, though I may be mistaken.