"You must get your normal 30 day extension before applying for the covid extension". You are assuming I have a Tourist visa. I will arrive on 30 visa exempt which does not have a normal 30 day extension. ;-)
are you sure? The rijksoverheid.nl website states that Thailand is on the list of 'safe countries' to travel from. So to enter the Netherlands you dont need a PCR test nor do you have to quarantine after arrival: