Not comparable. HL7 is a machine interchange format - virtually no docs or healthcare personnel except those involved in informatics (and then generally only superficially) are familiar with HL7.
These NOTAMs were designed for human consumption and brevity, they date back to the 40s (debate about their ergonomics nonwithstanding).
Generally, it's machine generated. I've only ever typed it out manually if I needed something specific for a unit test and that only for small messages. It's tedious to do by hand.