When the pipa plays, you can hear it from the fingering. Pipa fingering is the opposite of guzheng guqin. Pipa has a wider range than guzheng, so it can play this sound.
It's a bamboo flute. It can blow so sharp.
By the way, these recorded songs are all processed, covering up the defects and distorting them, or they may be simulated by electronic instruments!
PS: I listened to it again. It is made of an electronic organ.