I don’t think (s)he was commenting on education. I read their comment as only people who can do 12 hour shifts that may be required to occasionally be overnights followed by days, completely disrupting their sleep schedule, can make it as ICU nurses.

"Works on a shift schedule" is a shared trait between nurses and shift workers. "Has one thing in common with" is not the same as "is the same thing as".

Parent to that reply edited their post after my comment, and I can no longer edit my reply.