Here’s what he has to say about it:
This song was recorded using the orchestral sounds from IK Multimedia’s Miroslav Philharmonik virtual instrument. The digital organ it was played on is a Content D4330.
At a few points near the end of the video, you will see a “ghost” third hand appear. This just illustrates the addition of higher notes after the initial recording of the song.
The video was post-recorded by me, so there a few discrepancies in the video where the fingers don’t match the song – see if you can find them 🙂
Unfortunately, bylcj246 doesn’t include any information about himself on his channel. If you know anything more, leave a comment!