I really think you overestimate how likely users are to notice a redirect URL appearing in the address bar for a fraction of a second. Regardless, even with SE the distributor's URL will appear for a short time until the content has been downloaded and the signature can be validated, just as it would with a redirect. Anyone who actually cares to see which connections are made (which covers much more than what you can infer from the address bar alone) can open up the browser's developer tools and inspect the network traffic. Or you can fire up Wireshark if you're paranoid, but there is nothing in the proposals about hiding the true endpoints of the connections from the developer tools—just main URL shown in the address bar.

If you want to avoid giving the data to Google in the first place there is no substitute for checking the URL before clicking on the link, which will show the distributor's domain regardless of SE.