Sounds like BS. Crossing gates are been around for more than a little while.
My understanding is they’re using new radio-based technology to trigger the gates & flashers for the higher-speed trains and that it’s this technology that is the problem.
I was involved only in the early phases of that project (before it was awarded), but that’s what I understand is going on. There are challenges in trying to implement conventional train detection technology on electrified rail lines.