Really? That is stupid. Pull-up strength can be measured in traditional numbers or even made stronger by slowed down lifts and or holds which increase strength so much. New thought is that large numbers of pull-ups may not increase functional strength as much as fewer and slower (reducing momentum) pullups do. And less injury risk. And holds may even increase strength more. Like chin up holds.
Kips are a small part strength, the initial pull, and then mostly coordination. 75% coordination. It’s why little kids can learn it, when they are so small they have tiny muscles, not much testosterone at all if any. And you do ONE Kip to get where you are going, in gymnastics. No one does it repeatedly, it would be pointless. (You do it to get to the top of the bar and pause with “straight arms” holding the bar beneath you to then do other high bar moves.)