"Accurate"? Really!
Your first source, Steve Waldman, says fundamentalists are a subset of evangelicals.
"People often get confused between the terms evangelical and fundamentalist. They mean two different things. Evangelicals are a very broad group. It's probably a third or 40 percent of the population of the United States. Fundamentalists are a subset of that. They are very conservative politically. Have a literalist view of the Bible."
Whereas your second source, Ahab, implies evangelicals are a "subset" of fundamentalists.
In the late nineteenth century a group of Christians (that included several different denominations) with a more literal interpretation of the Bible split off theologically from the rest of Protestantism, which they called "high Protestantism". They considered mainstream denominations (i.e. Presbyterian, Methodist and Lutheran) to be too "cosmopolitan".
Based mainly in the south, they became known as "fundamentalists". However, in the 1930's a group of conservative fundamentalists became tired of the radical fringe that was dictating where fundamentalist theological thought was going (they felt that the radicals were too anti-modern). They split off, and began calling themselves, neo-evangelical Christians, which was later shortened to the current name.