Uhm... another round of funding. Showing that the tech was still not "here" even in 2021.
And still talking about a "headset". Not even close to what you're insinuating.
A headset just gives you a high degree of spatial resolution. If there is a way to RF-sensitize neurons with self-assembling nanoparticles, then you could still very likely stimulate large clusters of neurons with lower precision from afar using future, high-precision versions of beamforming/MIMO.
Now you're just posting buzzwords. MIMO helps with bandwidth, it doesn't defy the laws of physics, doesn't make the inverse square law disappear, doesn't make antennas smaller (probably the opposite). There is a reason why those experiments are done with helmets/headsets, and use light, sound etc, not to mention the entirely different purpose (voluntary use e.g. for disabled individuals to regain certain functions). Adding multiple layers of speculation and extrapolation on top of that just further proves that you don't really have anything to support your preconceived assumptions about vaccines and mind control.