I'm sure statics won't hinder your performance, it's just that there are much more productive ways to spend your training time. I always feel like I've wasted an evening if I do statics when I could have been working on strength, technique, lactic tolerance etc.
My suggestion would be only bother with Gym work if you can't get to a pool regularly enough. Of if you have a life outside freediving for which you want to keep fit
