Gradle version used by unity

This question is related to:

https://forum.unity.com/threads/gradle-goals-not-executed-in-unity.729962/

It seems that gradle v3.0.0 can no longer access output files:

https://stackoverflow.com/questions/48451949/gradle-3-0-splits-dont-work

though I'm not sure that's the case with gradle 5.5.1 that I'm using.

How can unity builds target different ABIs? Right now I can only generate arm builds that run on the phone

but not on emulators.