It’s not really bundled since you can move away and still keep them for power. 

They state

You don't need to be a Genesis customer to join – our broadband is for everyone.

If you're an energy customer, your broadband is billed separately from your power - and it also has its own app to keep everything simple.

So the question is are their prices comparable to the big providers, and when HFC ends for many will this be a better deal since they provide a quality router?  AFAIK One NZ don’t provide a router you can rent one or BYO.