I suspect that Scott and Steve will agree: A skimo race and a ski touring trip are very different events, and they favor training with a different emphasis.
To compare the events, up and down 5000′ feet is typical for a skimo race, and a decent time would be around two hours. During a race, the racer’s average HR would likely be between his/her aerobic and anaerobic thresholds.
In contrast, doing that same gain over 8 hours will be well below aerobic threshold, which allows that amount of gain to be done day after day, while still allowing for recovery.
I suspect that the general training difference would be additional emphasis on speed for a racer and a general emphasis on volume for the ski tourer. Both will need a lot of volume, but only the racer would need some speed work.
If the plan you purchased was for “skimo”, then I suspect that it was designed for racing.