Did you read the op?
Q: Do I need to do a clean install?
A: If you’re coming from another ROM, yes. If you’re already running ours, a dirty flash should be fine unless otherwise specified. If you have problems, try a clean flash before reporting issues. Refer to an above question if you are coming from a stock-based ROM or are possibly encrypted.
I did but my question has nothing to do with that QA. A simple yes, no would have been nice.