NOTE! The content contained in this article is based on Radeon™ Software Adrenalin 2019 Edition 19.12.1 and earlier Adrenalin Edition drivers. For Radeon™ Software Adrenalin 2020 Edition instructions, please refer to article.
So if you still are getting Wattman errors can be due to left over Registry keys or files/folders concerning Wattman that wasn't deleted when you deleted older AMD Driver.
As far as I am aware, Performance Tuning took over for AMD Wattman and is compatible with the AMD 6000 Series GPU cards.
EDIT: Unless Wattman is still available in the latest AMD Driver under "Gaming" Tab and then selecting "Global Settings". I don't know since I don't have a AMD GPU installed in my computer.