Somehow missed this thread. Yeah, I'd agree, these are most precisely not Japanese toilets, but rather options added western toilets.
I have a Hitachi--it inspires the next--which makes sense: as the sun rises (hi=日; tachi=立) it's the first place to go visit...is it not?
What??!! A ripe OLD age of 32?!! Life begins at forty...or for Uncle Frank, that was 50...so you're still a spring rooster there GaijinPunch san !! Live it up !!