He's far better than Richarlison, but probably not worth his fee.Because one poor season (in which he still got 18 g/a in the league) doesn't discount a 30 g/a season in which he was one of the best strikers in Europe and absolutely terrifying teams. Richarlison has never even got close to that peak.
Osimhen, if available tomorrow, would be wanted by most of Europe. Richarlison, who has almost no stand-out attributes, would not. That says it all about how they're rated by top European teams. Osimhen is far from perfect but he is a level above Richarlison.
There are other high quality CF alternatives who are on our list: Gyokeres, Openda, Guirassy etc.
I'm more worried about the market for wingers than CF.