Contrary to what he is overyhyping, it is clearly NOT a surprising confirmation of being in service since this is known since some time and even more it is just a prototype.
IMO it fits to 787 - like all other Y-20 prototypes 781 - 789) - and even more it is a prototype since it has still the huge red flag on its tail and not the low-visibility markings we know already. But that‘s probably why „Nickatgreat“ banned me.
