Ryanair says boarding passes "must" be printed, but also in their FAQ they say I can use the app?

I'm a british citizen flying from the EU to london. I cannot print this boarding pass because I don't have a printer. I've downloaded their shitty app and there's a QR code on there. I've flown Ryanair before and I just downloaded it previously, worked fine. But that was 18+ months ago. Is their advice on their FAQ that I can use this QR code on their app accurate? I don't need a VISA or anything because I am travelling between a non-EU country I have citizenship of, and an EU country I have permanent residence for.

Author: PlainclothesmanBaley