If this page is any indication of what the future holds, then we'll see the return of United's 500 mile certificates.
In reality, it's likely an aged page that was never removed. Unfortunately .bomb is cluttered with these types of items which makes getting reliable information a challenge. Take for instance Connoisseur Class. United renamed it close to ten years ago, yet the electronic receipts still reflect the old name.
Aside from United not paying attention to detail, a lot of the challenges revolved on United's reliable on Apollo for so much and it's cases like this that demonstrate the limitations of the platform.
On a side note, even though they are no longer visible, agents still have the ability to see if and how many e500s you have as I had an agent offer to use mine a few months ago.