The Jomon are just an excuse for Japanese to explain why they are supposedly superior to Koreans and Chinese. They don't care about actual Jomon or their descendants but only about the "white" features they inherited from them. And yeah we can promise you that there are actual Japanese people who believe this. Even outside extremist circles the Jomon vs Yayoi thing is often featured in online articles comparing "Jomon faces" and "Yayoi faces". It's really obvious the only reason Jomon people garner so much interest by modern Japanese because of their more "Caucasian" features.