OK, the quote is in here
http://www.katu.com/news/local/98981009.html
Kim Holm’s son, K., who Terri Horman photographed with his science project around the time she took a picture of Kyron that morning, said her son knew about the appointment too.
“And the teacher said, ‘I thought he left with his mom,’ because they thought they had a doctor appointment,” Holm said. “And then at lunchtime, Kurtis ate lunch with him every day, he wasn’t there at lunchtime. And then I got a call at 4:30ish, saying he didn’t get off the bus, I guess. And Kurtis said, ‘Oh yeah, I knew he was already gone all day Mom.’”
So it sounds to me as though the source was the teacher, not Kyron. It is a mangled paragraph, due to where the quotation marks are and are not...hard to tell. But it does not clearly indicate that Kurtis got his info from Kyron, at least not to me.