DofE Training, Supervision, Assessing at Bronze, Silver and Gold, from the New Forest to NY Moors is my dayjob in the Summer.
Your organisation has engaged an AAP (Accredited Activity Provider - Accredited by DofE HQ) to provide the organisation and delivery of this team's DofE Gold Expedition in N Wales.
Last year I supervised 4 teams planning their Gold Exped, in the Rhinogs, during a full school day and that wasn't long enough. There were equipment and resources issues but 30 mins, IMO, is not long enough. Even, being practiced with the eDofE mapping software (Based on the OS package), I think that I would struggle to plan a 4 day exped.
The routes will be reviewed by the Wales DofE panel but they won't comment on the choice of route. I know that as last year I was presented with a team's Gold route that planned to cross the middle of the Kinder Plateau, West to East, in a straight line. Those routes had been reviewed by the Peak Panel. The route was reviewed and changed by the team, under my supervision.
DofE make few hard specifications about the definition of the expedition and expect the organisers, AAP's, to provide Risk Assessments, AALA registration, staffed by ML's (or similar) thus providing a safe exped.
The last Gold Team that I supervised in N Wales had a day that followed the same routes as you have described. There are benefits to the team to cover the Heather Terrace but I would have made an assessment of their ability before they started it. My plan would be to meet them in the Bwlch Tryfan area and assess, weather, fitness, time etc. There are other options from there.
As a Supervisor the first time that I get to see my team's routes are when I meet them. Dynamic Risk Assessments start there. The Supervisor is the person who takes responsibility for the team's safety.
With a strong team, going well, in good weather conditions the route may be possible but there are other variables to consider. But I think that, for me, knowing that the routes had been prepared in 30 mins would start the alarm bells jingling. I'd be talking to the team and conducting a thorough kit check, as I always do, to start to build a picture of what may transpire and put plans in place to address any concerns.
Your options, I feel, would be to go into writing to the AAP, DofE Wales (based in Brecon), and DofE HQ in Windsor.
BTW it won't be me as Supervisor as I don't have any N Wales expeds this year.