We just disagree, you can call a duck whatever you want (and I agree you can).
However I don't believe calling a duck a swan makes
it a swan.
Or an adventure pack and expansion makes
it an expansion.
You believe calling something an expansion makes it an expansion, but you'll never convince me of that I'm afriad (especially when Bioware EA's PR department had very specific reasons for calling it an "expansion" IMO - most of which would be said to be more than a little disingenuous).
Or basically if someone tries to sell me a duck as a "swan" I'm always going to say "Er....... no. That is a duck!