Kashimo didn't Blitz meguna
The argument the farmer fans always bring up is that kashimo hit meguna three times without meguna reacting, therefore kashimo has to be a blitz lvl faster than meguna. The problem with this argument tho is that all of the attacks kashimo landed is contextual based on sukuna being surprised/caught off guard. Let me explain
The first time kashimo hits meguna is when he actives his ct and immediately tags him twice. This is not a speed Blitz however because meguna was caught off guard by kashimo sudden speed increase. In jjk if you not prepared for someone speed/speed increase you can easily get caught off guard because you have not adjust to that speed yet. We see this with toji vs dagon and kashimo vs hakari.
After sukuna adjust to Kashimo speed he is able to dodge and block two attacks back to back, which proves that he is not much slower than kashimo.
The last attack kashimo lands a hit is with a feint attack. Kashimo trick sukuna by pretending that he would use his blast thus making this a feint attack.
So kashimo is not much faster than a super weakened meguna. I probably agree that kashimo is slightly faster but it's definitely not anything significant.