I see... my VB4 site I'm using the newer HTML5 YouTube code that doesn't use flash (shockwave) code at all. Would you consider upgrading to the HTML5 youtube embedding? It will let your mobile users be able to watch YouTube videos on devices that don't support flash (all apple and some android devices).
I have instructions on how to change to HTML5 here:
https://vborg.vbsupport.ru/showthread.php?t=261336
I know there is a spot in AME3 to change the definitions too but I think the mod ignores that if vbulletin has a built in definition because I didn't change the built in flash in AME3 but my site is still using the HTML5 I set per the thread I linked to.