Plus it doesn’t account for digital because there are currently no laws saying they have to release those numbers. From what I understand about the comic book chain stores gauge how much interest a book will have and order directly from Marvel a certain amount of issues to cover demand. Then the stores have to hope it sells. If it doesn’t sometimes they send it back but there are times when Marvel will not let them sell unsold copies back to Marvel.
This is also why variet covers and reboots are so popular. Number 1 variants have the most demand and can boost sales for struggling books.
I’ve said for the past 10 years Marvel genuinely doesn’t care about book sales. Comics are literally only there as a way for people to preview the upcoming movies. Their value to the MCU outweighs the books sold. The MCU makes enough to cover for the comics