Route easement between Sheffield and Dronfield?

[drueberflug]

I've noticed that the Trainline (which is very known for suggesting normally invalid itineraries) seems to sell a regular Sheffield to Dronfield ticket (e.g. Anytime or Off-Peak Day Return) on a journey via Chesterfield.
Considering that a Sheffield to Chesterfield ticket is a bit more expensive and that the Sheffield-Dronfield ticket has no restriction code that would prohibit Break of Journey, could one use a Sheffield-Dronfield ticket to travel to Chesterfield?

 

[D1537]

Weird one that the engine has produced because of the engineering work / RRB. If you rock up at Sheffield at 2pm, it's the quickest route because the next bus from Sheffield to Dronfield isn't until 1450 (arriving 1510).

On a normal day, of course, your first train would actually call at Dronfield.