There's another way to get this exact same effect without a chrome extension and requires two steps:

1. Change your "Preferred feed view" to "Most recent posts" here: https://www.linkedin.com/mypreferences/d/settings/preferred-...

2. Unfollow every connection (N.B., this doesn't mean remove connection, just that you won't see their posts).

If you do this, it wipes your feed clean and will literally display "Something went wrong" where your feed used to be.

This has made LinkedIn truly blissful for me, but this only seems to work on the LinkedIn web app on my PC. Doesn't work on the mobile web app for some reason...