Looks like a complicated and expensive way to avoid running copper. "Up to 1Gbps" is not confidence inspiring, if you really can't put holes in your walls I'd try a powerline kit first for 1/5th the price
This is the YT video I saw about it: https://www.youtube.com/watch?v=Z2FbzCyiNr4
He used different transceivers and got 10Gbs
I used powerline before. From my experience its really bad, unstable, slow.
What did work pretty well though is MoCa, basically reusing coax/antenna cabling. I get a pretty stable connection roughly equivalent to 2.5G.