It's more that "stop the flow of urine" can interfere with your brain's natural connection to the pelvic floor when urinating (something that is very much automatic and reflexive rather than intentional). Definitely a lot of people often squeeze hard and end up contracting more than just the pelvic floor, like the glutes and adductors.

You can think about drawing up a pea with your urethra, or drawing your testicles up which helps direct the squeeze and lift of a Kegel. It's also important you pair Kegels with breathing - relax as you inhale and then engage your pelvic floor when you exhale. Since the pelvic floor contraction occurs automatically with exhalation, it becomes much easier to coordinate and build the proper connections.