How to completely erase data from plants vs zombies (xbox 360) on an Xbox one S

When I go to the reserved data (its the only thing that shows up) there is no other options other than "clear reserved space" when I tap (A) on it.

https://beta.support.xbox.com/help/games-apps/game-setup-and-play/cloud-game-saves-faq

How do I delete saves I don’t want?

You can manage your data for individual games through My games & apps on your Home screen. Here's how:

1. On Home, select My games & apps.
   
2. Highlight the game, press the Menu button
    on your controller, and then select
   Manage game & add-ons.
3. In the menu on the left side of the screen, scroll down to
   Saved data, then highlight the saved data for your gamertag on the right and press the
   A button  on your controller.
   
4. You'll be prompted to confirm deletion of this game save data:
   
   • Delete from console removes the local copy of this save. You can get it from the cloud the next time you play.
     
   • Delete everywhere removes your saved data from this console, the cloud, and all other consoles you play on.
     
   • Cancel leaves your data intact.
     

I see Plants Vs. Zombies on the list of Xbox 360 games that are backwards compatible on the Xbox One. If you have PvZ on disc, you should be able to put the disc in the Xbox One, download the 360 version, and continue on with the 360's saved game data
(if you had it stored on the cloud on the 360).

Games like EA's Plants vs Zombies, for example, to erase the data from this game it was necessary to contact EA, as the progress and etc were saved on their server. Maybe relinking your accounts might help.

Xbox one=Plants vs Zombies and Peggle 2 Xbox 360= Sniper Elite 2 and Need for Speed hot pursuit 2