Green Tea

I´ve been spending time on and off away from home and my water heater which can be set to 60-70-80-90-100ºC), so I´ve been using quite a lot of teabags I normally rarely use. This teabag is one I must have picked up at a hotel somewhere, but its brand name I had already come across when having a tea after my meal in a Chinese restaurant.
The teabag comes as a pyramid which is nice for presentation purpose, as the tea inside seems not too finely cut. So far the positive side, then the rest : the pouch in which the tea pyrimid comes advises to use water at boiling temperature… for a green tea! I chose to cool down the water a bit before steeping the tea. The brew was quite tasteless, apart from the somewhat bitter finish (because of a too high a temperature still?), not something I am looking for in a green tea.
Quite surprised as well of the very long “shelf life” of this brand´s teabags : I am sure I picked this bag up more than a year ago, and BBD says 21/6/2024.
I cannot find any really useful information about this brand, but from commercial sites I see the tea sells at a very low price, an indication of the tea quality???