529 question - room & board and COA

So, 529 money can be used for room and board. The institution publishes a COA which includes an amount for room and board. Does anyone know if this r&b amount can be used to determine an appropriate 529 withdrawal for a part-time student?

Is the “part-time” student enrolled at least half-time? If so, the room and board figures in the school’s published COA should be used to determine the qualified room and board expenses for 529 purposes, or if the student is residing in housing owned or operated by the school, use the actual amount charged, if it is higher.