I think the position is far from clear, the information given by Motability in their summary is contradictory, the summary does state but you will need to read your insurance cover booklet for full details
The summary mixes up similar terms
Repair or replacement of glass
If your window or windscreen needs to be replaced, you must make a claim through RSAM. You will need to pay an excess amount of £50.
I suspect that the full insurance document will have the terms fully defined, glass, in my view would encompass window or windscreen however I doubt that the wording is so loose in full agreement.