Minus 2005 is 17 years,
which is less than 20.
So Spelling Bee was not even two decades ago, much less “over” two decades ago.
If you’re trying to go by decades as a unit of 10-year time (i.e. The Oughts, the Teens), then you would not include The Twenties until we were at the end of it, so that The Oughts would be only “two decades ago”.
In any event, I don’t think Theater has changed that drastically. And while I wouldn’t necessarily compare Spelling Bee to Kimberly, that’s an argument based on aesthetics and dramaturgy, not spurious math and a vague idea that comedy has changed.