The referenced documentation does not state anywhere about collision being affected by animation sharing nor is the user expecting it to be affected. Even when the Collision Preset is overridden to BlockAll on the Skeletal Mesh.
This was reported and tested in 4.22.2 (CL-6574378) and reproduced in 4.23 (CL-6909519)
This repro uses the following doc for setup: https://docs.unrealengine.com/en-US/Engine/Animation/AnimationSharing/index.html
Results: Before an actor is registered with the sharing manager, it's skeletal mesh can having collision. However, after registering the collision gets removed from the mesh and can't be enabled.
Expected: Collision would not be affected by animation sharing.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-76049 in the post.