Boolean: Anybody know why is this True?

[Barrowman]

Based on the hierarchy, shouldn't we look at "and" first instead of "or"?
Or am I misunderstanding something?

It will look at the AND first but all that is saying is if both parts of the AND are true then it's true. In this case this fails so it would say false.
Then it also has to look at the OR and finds it to be true so the answer will be true.
Perhaps it would be simpler to understand if it were bracketed.
(if A is true AND B is true) OR if C is true.
So it's saying, in effect, if the first part is true OR if the second part is true the answer will be True.