Looking at the article - this is related to the Cellular modems in their telephones as opposed to the CPUs running in their Macintoshes.

Judging by Apple's success in creating powerful low energy ARM processors I'd be quite interested in seeing how they can do in designing their own 4/5G modems.

I’m keen for an understanding of how this would affect me, can you elaborate? I would assume the performance would need to be better for them to make the change + battery life.