To my knowledge the only Roku that supports WiFi6 is the new Ultra 4850. That said, any WiFi 6 router you buy will also support the older protocols, so all existing devices will still connect.
WiFi6 is officially known as 802.11ax, but when you look at the routers available you will also see support for .11ac, .11n, and likely even .11g, .11b and .11a. So any existing WiFi device will connect to them, as long as those older protocols are not disabled in the router. I'm quite certain that they will at minimum have g/n/ac enabled from the factory.
Dan
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