That works out well, since I'm revamping those models anyway. I was fairly certain all parts were connected but if Netfab says so...
Actually, on second thought, I'm not sure that's what the reviewer was seeing, since there was another model (long since deleted at this point sadly) that was ALSO rejected for printing, and it was most definitely a very solid, single piece. Same story as this one: deleted old product, updated new one, rejected.
My guess is that the reviewer saw the same names come back again and just assumed they were the same model, rejecting them out of hand without actually checking to see if they were fixed, resending me the same images. Which is also unacceptable, but makes sense anyway, since a person making a mistake is more understandable than a huge software error like this could be.
Just to not confuse the issue, I'll upload my new revamped models, rename the STL's to something different, rename the products to something different, and try to print them. These ones will definitely be a single object.