Alright, let's go through this video.
FN FAL (1:43) - The narrator nails it on the head - the rifle is one of the "most widely used" in the world, including, interestingly enough, Libya.
PKM (3:40) - Narrator doesn't recognize this and improperly labels it as a "US-made machine gun" which obviously isn't true.
Unidentified (3:44) - Narrator also labels it as "US-made" despite lack of identification. (perhaps someone can help me out?)
"Chinese Machine gun" (4:27) - The narrator identifies it as odd because it appears brand new. However this isn't out of the ordinary because large caches of weapons are kept in protective wrappings at their storage depots, that's the intent of caches after all. Later he says that "machine guns don't come with their own instructors", this is true, but it assumes that large portions of the military didn't defect and engage in training the civilian rebels who don;t have any military training.
MANPADS (4:56) - these appear to be SA-7s, relatively common in the Libyan arsenal and by no means an indicator of "western involvement". The instructor is probably just another Libyan soldier instructing civilians on how to use the weapons. As for requiring a "qualified professional" - that's true to the extend that guerrillas across the world qualify as a "professional"
US Army Helmet and Pistol (5:23) - you can't really tell what kind of pistol it is from the picture, let alone it's identity. As for the helmet, there is absolutely no indication it's from the US at all, from that picture it could easily be any of the composite ballistic helmets manufactured by any country across the world.
106 mm RR Ammunition (6:08) - Same deal here, narrator doesn't realize that supplies kept in ammunition caches are generally in good condition. He's also ignoring the fact that the US doesn't use the M40 any more, but plenty of other countries across the world do to say nothing of the various stockpiles that exist across the world.
Bottom line is that it's obvious that the narrator doesn't have a lot of actual military related knowledge which invalidates the claims he makes.