Matt granger just posted a video about how to do AFMA now if he is doing it correct then i am doing it all wrong what you think?
Lots of mistakes for a "pro".
He doesn't know the difference between back focus and front focus.
Testing at 5-10x the focal length, he's using the wrong distance for general shooting. The AFMA is often different near the MFD, so unless that's where you're always shooting, you shouldn't calibrate there. Things even out as you get further from the subject/target. In his defense, he's actually following the SpyderLensCal recommendations from when the product was first released. They subsequently fixed their mistake, and updated their recommendation to 30-50x the focal length.
His blanket statement that the DoF is 1/3 in front and 2/3 behind not a general rule, but applies with wider lenses and/or at closer distances (in the case of his 50mm lenses, he was actually at ~1:1 front:back, not the 1:2 he stated).