I've watched the 2 associated Bootcamp videos but cannot find where they mention that a supracondylar fracture can result in radial nerve damage.
However, in the following Bootcamp video: https://app.bootcamp.com/med-school/gross-anatomy/videos/anterior-arm?index=14
it mentions that an injury to the supracondylar region would likely result in median nerve of brachial artery damage, which makes sense given the location.
The closest thing I could find regarding the original card information is this article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9682549/#:~:text=As%20the%20median%20and%20radial,causes%20a%20radial%20nerve%20injury.
which states that "As the median and radial nerves travel anterior to the distal metaphysis of the humerus at the elbow region, they are at risk for injury in a displaced supracondylar humerus fracture. Posteromedial displacement of distal bony fragments usually causes a radial nerve injury. Posterolateral displacement is more likely to cause a median nerve injury." This is still not in line with the original card information, but also just seems to be a fringe case regardless.
Not an approved source, please review suggestion guidelines. Believe original source for this may have been UWorld. Median nerve damage would be caused by anteromedial displacement of supracondylar fracture