Simple. The same case with Terauchi Kosuke. No matter the studio, he is
always marketed & described as a "str8 guy". He would appear in the str8 model related series (Str8 Limit Interview, Str8 vs Gay, etc.) & has few str8 scenes as well. Meanwhile openly gay JGV models tend to have a slightly different assigned set of series.
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Is it possible that he's secretly gay, bi, just a convincing g4p or something else? Probably. But that's personal & not for me to say. We are all free to speculate of course. As long as he presents himself as "str8" just like many other gorgeous models in the JGV industry, he will fall under the g4p section in my library.