Is the timetable for the bus from Wangjing West subway station area to Jinshanling Service Area stil

Yes, it is valid.
The special travel line (Wangjing West Subway Station - Jinshangling Great Wall) you mentioned generally is operated from April 2 to December 15, departing at 8:00 from Wangjing West Subway Station and at 15:00 from Jinshangling Great Wall on back-trip. If there are less than 20 people on the bus, it may not start.

Therefore, you are advised to take the City Bus at Wangjing West Subway Station to Luanping and then get off at Jinshanling service area. About two hours are needed to finish this single trip by bus.

Then you can transfer to take the scenic ferries at Jinshanling service area, which usually depart at 10:00, 11:00, 13:00 and 15:30. The timetable departing from Jinshangling Great Wall is at 10:30, 11:30, 13:30 and 15:00.

What is the timetable and frequency for City Bus at Wangjing West Subway Station to Luanping?

Thanks

It usually departs from 7:00 to 16:30 and the bus leaves for Luanping every one hour.

thank you so much for the information!