What is Reddit's opinion of MIDI Visualizer?

From 3.5 billion Reddit comments

Thanks! No the visualisation thing is generated from the midi recording and composited in post. Similar to other visualisation video but I can't setup my camera directly above the piano, so I perspective transformed it in place. (Generated with this if you are interested: https://github.com/kosua20/MIDIVisualizer/)

Sure, could be hand-crafted in a video editor, but when open-source projects like MIDIVisualizer exists it's not too far fetched to think he has programmed his own software doing it for him.