I'd imagine explaining any of the words is redundant to most, though I do think most people are more familiarized with aishiteru than they are with banzai.
I thought about writing on how awful they are at using English inside their songs after seeing this (I'm soldier heart gives me headaches and it isn't even the worst example), but I guess most people realize that too.
Props for writing this up. I guess most people knew about it already, but helping the jp illiterate (I imagine most people realize this much even if they're not learning jp simply because of their anime experience) is always nice.