I can't post links here but you can easily find examples of this in youtube, just search Apex legends + Rage hacks.
How it is possible I am not sure, lack of IT knowledge and have 0 motivation to dig that info up, all I know that Apex is just like Swiss cheese = full of holes people exploit in various absurd hacks:
- aimbot
- wallhack
- ragehack / rapid fire
- no recoil
- automatic super fast weapon switching
- crazy bunny hops side to side
- multiple whatever needed other scripts that do things for you in unhuman speed
- controller turbo inputs on single fire weapons
- increased movement speed
- introduction of lag becoming harder to hit / invincible
And the list goes one to the level where people famously got hacked during LAN or online tournament.
Everything is possible in Apex :D somehow some way and seems like the dev team does not care or are unable to patch things up / keep game under control (lowest level of control) for now 4th season in a row = we went from abnormal number of heavy abusers to high number of abusers which is propagated as "success" but if you compare vs situation 10+ seasons ago we just went from ok to very bad to bad.