I tested this a few times. Seems like refreshing updates your queue position but doesn't either help you move forward or throw you back.
The only time it makes sense to do it is when you're right near the front of the queue, as you might get through slightly quicker. Maybe. But probably not worth it for a few seconds potential gain.
I'm not sure portuguese promoters failed to book Linkin Park, there's a big chance Rock in Rio has them booked for 2026 and doesn't let them play here before that