Jon's always been for gaming (and Nintendo) history picks and also tends to support the introduction of new genres into Smash, so I'm not too surprised to see him support it.
I have noticed Famicom Detective has become kind of emblematic of the Nintendo fan divide on Twitter, with a lot of big more "Gaming History"-oriented YouTubers/personalities like Jon Cartwright, Shesez, and Pushdustin discussing how it (and other smaller/nicher Nintendo projects) shouldn't be slept on or dismissed as shovelware, especially noting how people (including other YouTubers) are perfectly willing to ignore the games while simultaneously claiming Nintendo never takes risks and never does anything out of the core few IPs.
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I don't think we should, like, tie people down and force them to play Famicom Detecitve or anything, but it's an interesting point to think about...