It turns out the tea is green, but that they sell it as white because that's how it looks:China green Yunnan leaf tea
This Chinese green leaf tea has a large dark green coloured leaf with a very high amount of silvery tips. It is processed from the Yunnan large-leaf tea plant.
During a year there are three production periods for this tea: Spring production from the end of February to May, summer production from the end of May to August and finally the autumn production from August to Novermber. It goes without saying that each production season brings out its own quality with its own characteristics. The tea leaves which are tightly rolled give a bright yellowish-green beverage with a mellow taste and a lingering, fragrant aroma.
The main production areas for this tea can be found in regions of about 1300–2000 meters above sea level in natural environment. There the tea plants grow at an average temperature between 12°C and 23°C.
The discussion in the other thread has died off without a conclusion, so now that I know the tea is green, I'm asking here as well in case the green experts don't read the white forum as eagerly.