Yup, it seems pretty clear that they did.
Still, if I were one of their competitors, I'd be asking my lawyers whether the patent protecting that invention is likely hold up to a court challenge, specifically one that maintains that controlling power in this way is not novel; that it is in fact an obvious solution to the deficiencies of conventional e-cigs that Evolv lists in their patent. Variable wattage has been done for decades in certain applications (such as industrial furnaces) and for exactly the same reasons that Evolv used it in the Darwin and subsequent products -- to put a known, repeatable amount of heat into the 'work' despite the heating elements not always having the same resistance. As far as I can see, the only thing novel here is the application of this long-established method to e-cigs. The method itself is not novel. The examiners may not have been aware that this method existed previously because those who implemented it in the past for other applications thought it was too dang obvious to file a patent application.