It’s A General Term
“Nasal release technique” is a plain-language description people use for the balloon-assisted, through-the-nose approach to releasing the cranial bones. It isn’t a single trademarked method; it’s the category.
Closely related names you may see include endonasal cranial adjusting, cranial ballooning, and Bilateral Nasal Specific (BNS), the original technique developed by chiropractor Dr. Richard Stober in the 1960s and 70s.