I don't think it operated continuously from October 4 - October 28. For one thing, there didn't seem to be anything about it in the MDE data feed from those dates.
We (TouringPlans) have Primeval Whirl wait-time data submitted from users on these dates:
- Oct 5, 7, 8, 10, 14, 17, 18, 30.
We have users saying the ride was offline on these dates:
- Oct 2, 3, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 21, 22, 23, 25, 28
It's possible that the ride was only online for a few hours on the days above in which it operated. (For example, if the ride only ran from, say 10 a.m. to 4 p.m).
Also, the MDE feed for Primeval Whirl abruptly started last night around 10:15 p.m., and stopped at midnight. It hasn't run today. Maybe it's getting ready for next week.