You made 2 mistakes that I noticed:

1) MLLE refers to two things: Modern MLLE and Old MLLE. No one has Old MLLE(Except maybe some of the developers), and no one knows much about Old MLLE. New MLLE is a complete remake that's actually better than JCS, but it's currently more unfinished than Old MLLE.

2) It's OEM, not OME. This is a very easy to make mistake, though.

Both of these are quite minor, but I still think they are worth mentioning. Apart from these two errors, this is a brilliant Let's Play, and I'm happy I saw it. I've never actually seen a Let's Play of JJ2 before, let alone one of the Beta. Be sure to mention 1.10o at some point, because that one has JCS packaged with it, and that version of JCS can edit levels of another game called Battery Check.
Try these links to learn more info that's actually quite hard to find:
J2O Wiki - MLLE
J2O Wiki - Beta Versions of JJ2
J2O Wiki - Battery Check