In support of your point, 360MB/s is an extremely conservative estimate. I'd expect that from LTO-6, which is around ten years old, and I would certainly hope their backups are on more modern gear than that.
I work for a pretty huge well-known fortune 500 company with a global presence and personally handle the tape rotations for several of our data centers, and they're all still on LTO-6 tapes
I'm not sure that's relevant. I would expect Home Depot, Berkshire Hathaway, Alphabet, and Atlassian to have wildly different priorities. Two of them are Fortune 500 companies that I think would do fine with LTO-6. Atlassian is supposedly a cloud-first organization which arguably should be pretty aggressively tiered anyway, much less tiered onto outdated tech.