Doubtful, all the links were publicly accessible. I believe the researcher just crawled the "video.parler.com" domain after finding out they used sequential IDs

Doubtful, all the links were publicly accessible. I believe the researcher just crawled the "video.parler.com" domain after finding out they used sequential IDs. Allegedly Parler didn't scrub exif data from any media, including all of their "verification" materials including Drivers Licenses and Passports.