Most likely the US knows by their ELINT that it is only a weather ballon, with a simpel TX for temp, altitude and humidity. If they had an high data rate encrypted stream transmitted from the ballon it would be down already.
The package suspended below the balloon is reported to be the size, and presumably the weight, of 3 buses.
That’s a very big balloon, as it would have to be to be visible from the ground at 60K feet.