So basically: high school students don’t know what college tuition costs in their area; they realize they don’t know; many assume it’s unaffordable; many give up on college because of their (often inaccurate) estimates of cost.
These findings make a lot of sense. The actual cost of college is complicated, because it’s different for each person at each university. It’s completely reasonable not to look into college if you’re pretty sure you can’t afford it. And really, why would we expect 9th graders to know how much a college education costs?