NEVER? To start with, have Moodyz ever even make such a claim? If it's what they practise but not something they preach, eh... that's ridiculous.MOODYZ isn't a studio that uses fake cum. They never have and there's no proof of it. Speaking of which many, many bukkake and gokkun scenes from MOODYZ have been de-listed and removed from the market.
I'm a big fan of Moodyz, but only-real-semen is not an "integrity" I'd give to any studio.
I challenge even if there's a serious fanbase for real cum. Yes when there's a leak or a goof the online webospere has a virtual fit, but no one seems to do anything about it. The vast majority of JAV fans (including me) are well tolerant of camera and editing tricks.
The studio Honnaka 本中 was launched (and named) for "real creampie", but after a few years the creampies were exposed as fake and the studio quietly removed "creampie" ナカダシ and similar slogans from company motto. Despite or even because of it, the studio achieved mainstream status.
In another thread (and apologetically trying to return to topic) I mentioned the title ATID-487, Ren Usui 碓氷れん made two anal sex scenes with creampies (not counting the one using dildos) and each time had a mild breakdown. I wondered if the breakdown was real also. Just the same, whenever an JAV idol or your real life girlfirend moan and scream of orgasm, it's impossible to know if it's real or not.