Don't keep coins on exchanges is acceptable but don't keep coins on phone? i don't see any reason why because i think its safe on my own side, i have been keeping my coins on phone since 2016 and i have no issue till date, secondly my phone has inbuilt fingerprint and face recognition for anyone to access
He probably only said that because it's easier to lose coins in your phone than in your PC, but if you know what you're doing, phones should be perfectly viable for storage. This attack, for one, is practically limited to tracking victims, so there shouldn't be any risk of crypto loss. Just make sure you don't keep large amounts anywhere that's not cold storage.