Either he guessed wrong or AMD changed its mind as Radeon driver guy Terry Makedon posted on Twitter that a fix is coming soon:
Happy 2018 everyone!! I am seeing some stories pop up about AMD not supporting some old games. That is absolutely not true, we are identifying the bug and working on a fix asap. C&C, Witcher, BfME, etc will be working again.
— Terry Makedon (@CatalystMaker) 2 januari 2018
That is not true. We will for sure fix this bug with SAGE engine games in an upcoming hotfix. https://t.co/EEW42GTA73
— Terry Makedon (@CatalystMaker) 2 januari 2018