I use PLENTY of hacked clients both in single player and other servers (not meep) And I understand how they work, and boy let me tell you there is a bypass for everything and if there ins't you just need to spend 10-20 minutes coding one,
Here are just some of the bypasses
AntiMAC
AntiSPAM
AntiNOCHEAT
Nocheat+ Bypass
Yescheat+
Those are just some. So my point is that there are so many hacks like if I used AntiNOCHEAT and coded a qucik AntiXray bypass I could just use an OreESP and find what I want Plus there is freecam by using Freecam and Yeschat+ you can litterly xray anything
Just keep that in mind