The time line mildly doesn't make sense. In the year that Hinata was a second year high school student, Tokiwa and Hase were third years. Japan's system is three years. It has been eight years since then. The current high school members of the art club recognize the pair.
It is completely possible for alumni to maintain contact with their old school's club. I get that. It just seemed a little strange that the current high school students, who are at least seven years younger, immediately recognized both of them. I can realistically understand them knowing about Hinata being comatose for eight years.
Is it a big deal? No. Just seemed a little odd.