It was never safe. Also, it's the money and rp you get using CE that makes marks your account as suspicious.
It may just work like "GTAV finds suspicious files in folder - marks account - if stats are abnormal-> ban."
For CE: "GTAV doesn't find suspicious files - doesn't mark account - player uses cheats - stats are abnormal - it somehow gets noticed -> ban"
So no, not safe. Unless you only do stuff that doesn't damage your stats. That is, no money cheats, no rp cheats, no items, weapons, vehicles whatsoever.
EDIT: Evidence time. Ask a banned person what they used. The honest ones will tell you they did above stuff. The others will say they didn't.