This could be good news for anyone who are far away from the G.fast pod to the property to get shorter cabling route by the engineer with option to pay.
Only if the reason that they are far away is because the Openreach cable takes a roundabout route on the customer's own property.
For example, if for some perverse historical reason the phone cable was an aerial one which arrived at the front of the house, then was wired (on Openreach's side of the socket) to a shed at the bottom of the 50m back garden and then back again before terminating in a master socket in the dining room then BT would as part of the service rearrange that wiring for you. Of course the reality is that in many domestic situations the customer might (in breach of their contract) rearrange BT's wiring to avoid the unnecessary loop to the shed rather than pay BT to do so.
This service is more likely to be purchased by people who want the GFAST router positioned a long way from where the cable currently enters the property - i.e. they want it on the third floor of an office block but all of BT's cables are terminated at a DP in the basement. For a price BT will run that cable to exactly where in the building you want it.