I can't imagine that the Switch would be able to sell another 20mil in Europe. Just look at how well the system have sold in the region so far
13,88mil (2017-2019)
20,70mil (2020) (+6,82mil)
26,98mil (2021) (+6,28mil)
Even if the system sells 5mil in both 2022 and 2023, it still needs to sell another 10mil after that. It doesn't seem very likely.