If you supported him for 7 months, including college, and he only supported himself for 5 months, then it's highly likely that you can claim him as a Qualifying Child (QC) dependent. If you're confident of that without doing the support calculations, then you should claim him. But, there is no rule that says supporting him for more than half the year automatically means that you provided more than half the total support for the whole year.
The college months are usually particularly expensive. But, for example, if you paid the spring college bill in December 2022, then those months might be "lite".
