Maybe[1]. Scientists don't like to waste time on alien life origin theory as it doesn't really solve anything, we still would want to know how tardigrades' home planet created life.

[1] with chance damn close to zero

If there was a competition to find the craziest idea that will one day be found to be true - I'd pick panspermia. Although all life being descended from tardigrade cancer is a little out there even for me.