Chelles is the end of the TGV line, so it was slowing down to 160 km/h.
From Chelles to Vaires the speed limit is 230 km/h (on the middle track only), after it 320 km/h.
I think they might be trying to talk about the fastest train line at that time in the world, but true doesn't seems right when you thought of it.
More likely a direct translation from french.
I could send a mail to ask about the title, not sure they will like it.
For the title in french I didn't pay attention, my local train was arriving on the other side of the platform.