The way I read this is that between 06:00 and 07:00 local time from 1st June until 1st September there will be no inbounds allowed. I assume this has something to do with the busted noise limits and the letter sent by the airport to the operators. Wizz often arrive early but this will hit the biz jet community more.
Remember we are BST or GMT+1 in Summer months
Don't we have NHT closing soon for a while, OK that had no night movements but their daytime movements will have to go somewhere!