On the day you are in the park, any attraction that is temporarily closed will still show up with a "Reported Closed" warning. We don't remove those attractions from plans because they will presumably reopen. If you optimize your plan while in the park while an attraction is reported closed, our software guesses when it will reopen based on past data and will schedule it after that time.
Obviously some reasons for closures have more of an impact than others, so our predicted re-opening time may be wrong. If the attraction is still closed when your revised plan has you heading there, you can optimize your plan again or simply skip the step until the ride reopens.