My understanding is that one of the vendors Parler used provided a detailed inventory of the services that were being dropped. Then the tranny found a way to crawl through it all and grab the data. https://mobile.twitter.com/donk_enby
See for yourself... https://archive.org/details/archiveteam?and%5B%5D=parler&sin=&sort=-week&page=1
Technically not a hack. Parler fucked up and due to misconfigurations and neglecting basic privacy concerns, tranny was able to scrape 80TB of data. Now they are combing through it and have posted a map with 68,000 geolocations of where videos were either uploaded from or taken.