Video came out of a low flying U.S. Blackhawk chopper…. It was the Taliban practising with their new toy….
I don't think it will be a major concern.
The U.S. disabled much of the equipment they left behind. Much of the other stuff (like the previously mentioned blackhawk helicopters) need both pilots (many of whom have fled the country) and regular maintenance (something that the taliban probably don't have the expertise to do themselves, and its doubtful other countries will help). So, they will have their toy helicopter for a few months, but will probably eventually it will end up grounded for lack of spare parts.
The U.S. did leave plenty of rifles and other small arms, but they use NATO-caliber ammunition, and when the supply of bullets runs out in Afghanistan, those guns will just be very expensive paperweights.
The Taliban may try to sell some of the equipment abroad (Hey, want a cheap humvee?) but the former Afghan army wasn't exactly given state-of-the-art equipment.