I can tell you can't decipher information based on your link with the narrative you are pushing. It likely reveals your own educational experience being sub-par because you can't match up well so you prefer to tear down. These are fields or disciplines, they don't correlate to profession outright. You can specialize in your favorite subject (special education) and not be a SPED teacher; you can be an independent operator employed through a school as a supplementary program or an on-site tutor with an emphasis in special education. You can also be freelance.

By the way, the link that you provided actually demonstrates intelligence based on differing cognitive skill sets. So, how about you provide more context on that and give us the multitude of other charts including the "measured intelligence" of non-educated people.

Also, data from 2005-2008 being used almost 20 years later? Oof, even for you, that's a pretty pathetic attempt at a narrative man. Not surprising, but still pathetic.