You likely meant 50 Gbps as its what come up on their website and some recent US fibre discussions.

In any case even 50Gbps likely a huge part of their total throughput and you wont be abble to use it at full speed. So its pure marketing.

I just checked, and now it is 50 Gbps. Not long ago it was 300 Gbps when I moved into my house. I guess they lowered it. Not really any use for such speeds in a residential home anyways.