Eeeh... I can see why it's hard for some to believe- especially as your desire would want you to disbelieve it possibly.. but honestly you could also easily explain away why male viera are vaguely mentioned too in context of "I don't really want them".
The first step of the problem is probably not being in the mindset of genderlocking is okay, which clearly SE was at least (XI/XIV). I would say it's safe to assume others who have worked at SE in the past could have been too (maybe not all, but not some legendary rarity only at high levels of their MMOs). Also comparing to other Asian games... seems likely to be a thing.
Imo its clear female Viera's visuals at minimum were picked for their sex appeal, in fact they're so out there that if it wasn't for the fact they're from SE themselves I'm fairly certain I'd get in trouble for posting too many photos of them lol. Put the FFXIV version in their race outfit in a few risque poses within the game and you have yourself a cover to some adult content sold in Japan.
Now what's a good way to kill that sort of fan service/playing to sex appeal? Make them incapable of what people see in them.. SO imo in this idea, and accepting that genderlocking isn't bizarre to some people there, /of course/ the male viera are mentioned and of course they're only vaguely so. Male viera are only a backdrop that paints an image, and oh my are the male viera literally just a tiny footnote in the series lol.
So I think if you tried to shift your perspective to someone who doesn't think such fanservice and such locking isn't so weird that that your statement "they wouldn't have created the lore if they didn't like them" becomes /possibly/ untrue. I'm not saying it's for sure, but I think if you shifted your view of things (which one must if we're trying to imagine changing our shoes to someone else) that it's actually possible that male viera's existence in the series is a little blob of ink to better paint female viera exclusively and all that matters is the females.
Could be untrue of course but I'm just saying you think they're easy to explain away and I'm saying it's true both ways, unfortunately :P.