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Originally Posted by WhiteRanger

He created the show so it could do. I all way said any thing kamen rider he worked on is Showa up to J when passed its hesei in technically terms there hesei but if you take in the creator terms there Showa

I think it's more that Kamen Rider has been running uninterrupted now since 2000 and Toei refers to this era as the "Heisei era" of Kamen Rider to differentiate it from the 70s and 80s shows, which mostly aired during the Showa era. Yes, Shin, ZO, and J also debuted in the Heisei era (and most of Black RX aired after Hirohito's death and the end of the Showa period, too), but they aren't part of the series of shows that began with Kuuga. Honestly, they're pretty much just completely odd outliers that don't really fit in with either era of the franchise. But because Kuuga is the official start of the Heisei era, the 90s guys get grouped with the Showa Riders by default.