This is not true, I purchased a Model 3 brand new in 2021; it has HW3 and it absolutely does phantom braking regularly on road trips. This is on US interstates.
Why do you keep driving it? I had a car that did this to me twice and got rid of it, the first time could have been a glitch but twice is simply broken and dangerous. The dealer said the car was fine.
Yeah, you're right. I haven't had a phantom brake in quite a while, and even the ones I used to have were not so aggressive as to be unsafe. Unfortunately, I suspect downvoters are conflating 'observing phantom braking has been fixed' with 'complete endorsement of everything Musk does'. Black and white thinking and whatnot.