The handout sheet - copy attached - seems to imply that the train service improvement is Melksham only (on no it isn't!)
I agree that is a perception which has been hard to dispel. The extra services over an eight mile stretch of line fill in a part of a jigsaw for many people's journey.
Just this morning I have been planning a journey during the closure of Whiteball Tunnel. One of the new services can get me to Westbury from Swindon to link into one of the trains diverted via Yeovil. The alternative is to leave 20 minutes later, make three changes and ride on a replacement bus. I know which way I am going to go.