I played cod black ops 4 on my ps4 and then a team member of me was just flying, sliding and jumping like in Black Ops 3? You could ONLY fly in Black Ops 3 and never in Black Ops 4. There was also never an extra or an event where you could fly and only he could fly this remaining boost display as in black ops 3 was seen when he slipped or flown. Can someone explain to me how that can be?
From 7 years of PS4 experience I can only say that I have never met a hacker in any game. Some games do not even have the option to report because there's simply no need to. In Apex Legends, the possibility of a message was added just a few weeks ago because of the activation of crossplay.
The possibility that you met a hacker can't be ruled out, but there are usually other explanations for this.