Yes, I had a look a this product and can find no mention of it supporting G.Fast either. Looking in Amazon questions for the device, most people state it is not companies and has been listed wrong on Amazon. Even though it does say G.INP support in the datasheet.
I can’t see much for third party routers supporting G.Fast.
If you got lucky and your install included a Openreach Modem then you can just plug any router into this, provided it has a WAN Port.
If you don’t have this, you can look at this guide, made by someone also on G.Fast, on turning the Smart Hub into a modem so you can plug your router into this.
Hope that helps.