Juno is just a web view and acts as little more than a browser extension that modifies CSS to make the website and video player look more like “visionOS”. No logos other than those already placed on the site will be placed and the addition of “for YouTube” is permitted in the branding guidelines.
I said this to YouTube, they didn't really want to clarify or give in to anything, and since both parties couldn't come to a conclusion, a few minutes ago I received an email from Apple that Juno had been removed from the app store.