I asked him and he told me that he stays in L3 with the global one, he still hasn't answered me how it would be with the Chinese ROM. Something I don't understand is that in the product title it says L1 widevineHmm it could work. I believe the L1 is related to the status of the bootloader. As far as I know all vendors ship their devices with an unlocked bootloader (it doesn't matter if the device's running Global or Chinese rom). Mine arrived with Global rom + unlocked bootloader -> I flashed it back to the Chinese rom (still L3) -> I tried to re-lock the bootloader but failed and got bricked lol.
So, you could just ask them if the device has L1/could stream Netflix higher than SD straightly. Good luck