I've been trying to mimic other people doing this glitch, I do this.

1. Token cancel
2. Wait about 1-2 seconds
3. Jump into IC
4. Groundpound
5. Jump back into IC
6. when the IC animation ends, land back onto ground and crouch, pause the moment you crouch
7. Go into snapshot mode as fast as possible and hold "W"

Am I doing anything wrong? Is there something I am missing?

Yeah that’s right. Just need to jump out of ic and back into it. It has tight window which is why it’s difficult