This was posted to the Subreddit and thought those here might find useful as well
He uses Render in Place as work around to broken Color Management in Fusion.
I personally have just abandoned Color Managed workflow. I have my power grade with a Clog3 to DWG CST as the first node and the last node is a DWG to 'Timeline' CST.
This accomplishes all the cool features of Davinchi Wide Gamut, but actually works with fusion.
You do however have to create a power grade for each camera with the correct first CST node (eg 709 to DWG for my gopro).