Adobe Sensei Remix tool in After Effects?

I'm not sure that Remix ever will, but Scene Edit Detection did - so you never know.

After using Remix in Premiere Pro, we can copy and paste it from the Premiere Pro Timeline to the After Effects Timeline.

A Remix will paste as a nested Composition at the same time position it has in Premiere Pro, but like any nested Comp can be moved earlier or later in an After Effects Timeline.

This isn't a live link.  So, if the Remix is changed on the Premiere Pro side then it needs to be copied and pasted to After Effects again.

Also, the audio needs to be stereo or mono as After Effects doesn't support more than two channels for source audio.  Probably not going to be an issue, but worth keeping in mind.

After Effects is a video effects and animation tool designed to create shots, it is not a video editing app and never will be. You can use Dynamic Link to send audio to Audition for fine-tuning audio clips, and you can use Premiere Pro and dynamically link shots (entire sequences are not a recommended workflow) to AE. 

If the goal is to retime a music track for an edited project, then AE is the wrong tool. Personally, I think it would be a waste of resources needed to improve After Effects to devote time to implementing AI (artificial intelligence) audio features into After Effects that were designed only to retime music. Some smart audio effects that could isolate frequencies or find beats to help us more quickly set keyframes may be of some help, though, on the other hand, making a cut two or three frames before or after a beat can completely change the mood of a sequence. Editing a conversation between a man and woman with closeups of their faces can change from a romantic moment to an argument by simply cutting before or after a blink. It only takes one frame to change the mood.