I don't trust the footage. Someone could have dubbed their voice and electronically alter it to sound crackled and muffled. The VHS static effects can be duplicated. The advertisement's script is too hokey. The ad is featured on the Newgrounds' YouTube page and features a variation of the Tank logo that is converted to look like it came out of the early 1980s. All of this reeks of hoax.
When people claim they found a commercial on some old tape and want to showcase it to everyone, you can bet that some larger-than-usual deception is being carried out. Think of who is presenting it, folks: the same cocky bastard who thought a game that pays tribute to the movie "The Room" is a great idea, citing the movie as the best ever made.
In other words: don't bend over to this crap.