That probably was wrong wording from my side, sorry. Not “phased out” in the sense that you don’t get updates, but they said they would not update the Android support to the new Aliendalvik layer:
Jolla shop
Support for new device options is a constant request from Sailfish X program users. Adding new devices to the Sailfish X portfolio comes with a cumulative maintenance cost. This has resulted in a decision that we won’t be upgrading the Android app support to Android 8.1 on the Xperia X, or other older generation devices like the Jolla C.We simply don’t have the necessary resources to do it justice given the older hardware and several additional HW adaptation versions needed to support them now and in future.
That looks like the first signal towards the X not being a “first-class citizen” anymore. If you don’t need Android apps it’s perfectly usable for now, but it is probably the first one to get axed in the future — also because it comes with the lowest supported kernel version:
[release notes] Koli 4.0.1 :
The lowest supported kernel version of Sailfish 4 in the remaining Sailfish OS devices is 3.10. It is in Jolla C, Jolla Tablet and Xperia X