I am having a similar issue with v10 where I have changed all the fields to rename the project that I can find yet when I render the project and put it live, there is one place which is visible and showing the old project name.
Below you will find the results page in the first image and the balance of the images are showing the fields which have been updated. I cannot locate the missing field that needs to be updated to remove the "OldCo" information.
Any assistance you could provide would be appreciated.
What you have shown us in that first image (I'll capture and share below) is likely something that is part of the skin.
I'd say you need to open the skin editor. (Project Set-up pod) And check there.