the number of people involved with this blog post is likely no less than 100 people across 15 teams.

100 people is more than Apple has working across 3-4 major products, so no.

They work in much smaller teams.

What you describe is some IBM carricature of the 1980s.

No.

I worked at Apple, and they told me when I left I could not put anything about my work on LinkedIn. I didn't work on anything that would be considered remotely classified to any other companies. Apple treats EVERYTHING as super secret. It sort of worked for me, because when my current company asked what I worked on I just said "sorry I can't talk about it ;)" instead of "I was paid almost 200k a year to make one spreadsheet look like another"

Which one of following levels of information you can put in your public resume?

1. I worked at Apple. 2. I worked I’m MacOS division. 3. I worked on MacOS UX. 4. I worked on MacOS dock enhancements.