Hello @Bryn 

Thanks for your post.  

While this cannot be completely disabled, you do have the ability to disable the push notification. Push notifications are "pushed" to your mobile device when the Strava app is either closed or running in the background.

This can be turned off by going to:

You Tab
Settings (top right)
Push Notifications
Un-toggling Device Activity Synced

The push notification settings do not affect the in-app notifications you receive in the mobile app or on the Strava website. 

We also have an existing thread where we are collecting feedback on this topic, I can see you have already added your comment there also, thanks for doing that.  We appreciate you taking the time to share your feedback.

I do not need these superfluous notifications, hey guess what I did a ride, dont need a bot to tell me "Hey you did a thing"
Stop it

Strava, why do these pointless notifications need to be there? 
Marketing/User Experience department should understand that it is driving more people to simply turn off push notifications altogether, thus reducing Stravas visibility! 

Yes. And I have disabled most of the Strava push notifications. But these rather silly notifications clutter up the list of notifications in the app.  8 can't delete them individually, and they obscure other notifications that I might be more interested in.  Please produce a consistent management regime for notifications - off/on/on&push.