Ah, right you are about that my friend. Hallstadt was a boomer to be sure, but mostly later one. The link you refer to is an excellent and I think important one between some Chinese finds and the Celts.
I was thinking of the time of David, which was ~1000 BC. The "Celts" at Hallstadt at that time were of the "Proto-Celt" variety. Related for sure, but displaced in time from the big Celtic invasion from the East which occured later.
It's amazing, I think I have made a connection of the Tarim Mummies to a Chinese woman (young and educated) in my local Chinese restaurant.
She was floored (as well as her husband) when I told her that I thought she may be a Hakka Chinese. She said that she was and sat there with her mouth open as I told her how we may be related through the Tarim Basin.
She just sat there shaking her head 'yes' as I told her (what I knew) of the history of the Hakka. She said that all had often wondered where the 'wavy' hair and high nose bridges of their 'clan' had originated.
The Hakka migrated all the way across China and were know by all as the 'friendly guests.' She said she was well aware of the 'guest' part but had not heard it associated with 'friendly.' Her husband, who is from Hong Kong said, 'who are you'? LOL. (Isn't this stuff GREAT!!)