Wrong. It does not count as 4 Units per one Purchase, it's 4 Completely Separate Albums being released on the same day. They are packaged and sold individually as single albums. Each unit sold counts as 1. If they were packaged all together, they might get the 4 for 1 situation, but not the way he's been doing it. They might as well be named 4 different titles, they are being released as 4 albums on the same day, he just presents it as a collective, but it's not packaged that way.
Plus if you look at the Sales Charts, Soundscan, Billboard, etc, you'll see E-40's recent albums all over them in different places, that's because there are so many versions of them. There's the CD Retail releases, there's the iTunes version, there's the Deluxe Versions, they're all separate, and they all hit the charts individually.