A player is using x ray to mine

In-game name: gtketk
What happened: a player using x ray
Coordinates (if applicable): x -3785 y 5 z -1232 (survival)
Who you suspect and why: discord
Screenshots and evidence:

discord tells me that when he founds a base, so dave76, homen06 and me done a reseach on discord and found he does hacks like scaffolding and freecam etc. discord also lived with me and i guess i should go to our first base OLD SKYGUARDIANS when i went there, there was new tunnels i went all of them and found that he is using x ray. hope it helps