No. Google pays to Firefox in order to avoid antitrust (like Microsoft at some point donated to Apple). Google does not force any decision on Firefox developers.
When you are using de-googled chromium, you are supporting Google in their forcing of new web standards, which are better for Google. There are more and more websites “tested on Chrome”, because all other browsers are non-existent, like it was in the time of Internet Explorer.
When you use Firefox derivatives you at least don’t support Google monopoly. But you also do not really fight it, since all those browsers have negligible market share and will not be noticed in the browser wars. Also, in this way you don’t support the actual developers of the Firefox core, which deserve their money. Why do you insist on not using the original Firefox?
In addition, Waterfox is developed by someone not very famous (at least to me). If you are using it, you have to trust Firefox and that Alex Kontos. Why would you expand people you have to trust? For your security you should trust as few people as you can. I like IceCat more because I trust GNU developers. They have a good freedom-respecting and security history. Where does Alex Kontos get his money?