I'm usually very sceptical what it comes to claims this amazing. But everything here makes sense. You can definitely do constructive interference at desired loc

I'm usually very sceptical what it comes to claims this amazing. But everything here makes sense. You can definitely do constructive interference at desired locations, it's just matter of computing power. If you have n+1 base station antennas, you should be able to support n simultaneous data streams at the same frequency assuming insignificant path losses.