Can confirm all the revenue should be going to ENZC, based on the PR's and disclosures I've seen. Afaik they'd account for the revenue on the ENZC books even if they manage operations through a subsidiary.
I wonder if the confusion comes from the recent disclosure that quoted the following:
That's a totally different thing than IPF Immune revenue.
The only 50/50 split I'm aware of was for an ITV-1 licensing deal in India, Pakistan, and certain African and middle eastern countries. That's a different product and different market than IPF Immune.