And now I gotta learn kotlin too??
fu google

Good news: no.

In fact, them supporting it hardly means anything, since it's a fully Java compatible language you could already use with Android. This just puts the official seal of approval.

That being said, I've heard it's very nice to use and easy to learn, so maybe it's worth the trouble :)

You don't have to learn it. But I highly recommend it because it is seriously way better. I started with it close to a year ago and fell in love.