Copypasting my other replies:

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Fake angles are when you send an angle to the server but do not set that angle on your client. This allowed spinbotters to look around like normal despite the server thinking they were spinning around, staring at the ground. This is why from a spinbotters perspective the game is normal but according to other people (and demos) they are staring at the ground.

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Antiaim comes in different forms. You can make the server think you are looking backwards and down so your head is behind you and harder to hit, you can make it so you look left/right while peaking a corner so your head is behind the corner, or legit antiaim which looks normal visually but your head is actually sideways so if someone shoots directly at your head they miss.