You are correct! I didn't have my reading glasses on the print on my "card" is tiny. The 400 feet is listed under "safety guidelines".

I have been reading through all their crap and there are inconsistencies everywhere. The support page for LEO does not reference altitude at all. Mention of altitude is also missing in other areas of guidance, even as a "guideline". And I know why: I just went back to the original text of 333 (a) and there is no mention of altitude.

Only the 55lb, avoid full scale traffic, the 5 mile proximity to the airports, in accordance with CBO, model aircraft.

What a mess.