It's more likely that "clip" has been popularized by Hollyweird, most likely because some ignorant writer thought it sounded cooler. Even though it's technically incorrect, it's become a generic term, and thus, acceptable.
As far as pre-ban and post-ban, the ban is now over. The original law was for 10 years, with the hope that it would be extended at the end of that time. Instead, congress opted to allow it to lapse. What that means is that anything that was affected by the ban is no longer affected......meaning that unless you have a local law making it illegal, you can now buy any size magazine you can find for your firearm, folding stocks that really fold are now legal (the ban forced manufacturers to make a "folding stock" not be able to fold......really dumb!), and there's no limit to how many assault rifles the dealers can import, or from where.
The only thing I wish now is that I had sold all my extended mags back when you find them new, for more $$$, and then bought new ones once they were legal again. Oh well, hindsight is 20/20, isn't it?