I bought it yesterday. Epic installed a shortcut on my desktop like I asked, and it’s a Uplay icon. But that launches Uplay and then launches the game.
However, I did launch Uplay just now separately on its own, and I do indeed have Far Cry Primal in my library of games now, but it shows it not under the games I currently have installed, but my overall game library. So it looks like I could uninstall the Epic version and just install it from the Uplay app if I want.