You're right about the limited usefulness of the journey-planner in this particular case.
My point is that if Gerald was intended to run as a relief to the regular 0822 ex Holyhead, it should have been prominently advertised as such on the ATW website, and elsewhere. For, at risk of repeating myself, how are folks supposed to know of it's running?
Personally, I would much prefer to travel in the relative comfort of Gerald's stock, even if the journey did take longer, than being crammed into what was presumably a 2 or 3 car dmu.
So, as I cannot see ATW financing these poorly-patronised jaunts from Holyhead to Cardiff and back, I do wonder who sponsoring them, and why are they not being more effectively marketed?