The title is still clickbait given the reason nobody has heard of it is that it barely exists and is not useful yet.
Also, it smelled a bit like wishful thinking to assume the high precision clock would not be driven by GPS on real world deployments. I know some cell towers synchronize via PTP, but a great many others use GPS as their time source.
For anyone who deploys GPS-based timing systems at scale, having more sources of precise time is a huge boon. (Some companies pay many millions for dark fiber just to have a redundant time source).
Holdover can only help so much, if there's a persistent jamming effort, it can wreak havoc on many time-critical systems.
Also, it smelled a bit like wishful thinking to assume the high precision clock would not be driven by GPS on real world deployments. I know some cell towers synchronize via PTP, but a great many others use GPS as their time source.