It can be done in the shell, they are available online. I have not tried them.Pasteurization is the process of treating foods with mild heat, usually to less than boiling, 100 °C (212 °F), to eliminate pathogens. It is usually done to milk.
So they are cracking the eggs out of the shells, mixing them, and then heating the pre-scrambled eggs to a temperature sufficient to kill the E. coli but not actually cook them. They are then packaged and refrigerated.
Many people believe that the process makes them taste odd or funny.
https://ask.usda.gov/s/article/Can-shell-eggs-be-pasteurized
KNOWLEDGE ARTICLE
Shell eggs can be pasteurized by a processor if the United States Food and Drug Administration accepted the process for the destruction of Salmonella. Pasteurized shell eggs are now available at some grocery stores. Like all eggs, they must be kept refrigerated to retain quality. The equipment to pasteurize shell eggs isn't available for home use, and it is very difficult to pasteurize shell eggs at home without cooking the contents of the egg.
https://www.safeway.com/shop/product-details.138350287.3132.html