Oze - Transportation to Hatomachitoge

I want to go to Oze National Park in the first week of September, but I hear that the bus from Tokura to Hatomachitoge operates only on weekends in early Sep. But I also found this timetable that seems to say the bus operates on weekdays as well during this period. Which is correct?

http://www.kan-etsu.net/publics/index/43/

During the beginning of September, the road to Hatomachitoge is open to regular vehicles, but the buses and "shared taxis" between Tokura and Hatomachitoge opeate, nevertheless.

Scheduled bus departures are at:
4:40
7:50
8:55
9:40
10:20
11:10

Additional, unscheduled departure by "shared taxis" are furthermore operated from 7:50.

Thanks for quick response. also, how do I book a mountain hut in the park? All the websites seem to be in Japanese.

I think you have to phone them and hope someone can speak English. Or likewise ask a friend with Japanese language skills to call.

Or possibly the following website may be able to help as a custom request:
https://www.japaneseguesthouses.com/