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Here are the problems with that tech so far.
1Gb+ speeds are only good at less than 100 Meters.
500Mb needs to be within 100-149 Meters.
200Mb needs to be within 150-249 Meters and so on.
150Mb needs to be within 250-500.

These distances are based on G.Fast hub distances and between the hubs there will still need to be fiber.
The cost savings is to not have to have Fiber to home and instead put a hub on basically every couple city blocks and have fiber go between the hubs. There still needs to be massive fiber infrastructure for the quoted speeds.

Another issue is there is a limitation for the impedance of wire at the home. If your home is old enough or there has been enough degradation on the line it will not be possible to get the quoted speeds.

It is always good to see potential solutions to existing problems, I just don't think this is a viable solution and is not future proof.