Earlier quoted context omitted.
It's definitely a coincidence
It's not a coincidence or a cartel, it's PR counterprogramming.
In my experience it take weeks if not months to coordinate a release, from testing to documentation to drafting press releases in multiple languages to benchmarks and website updates.
I’m old and I’ve been in this industry most of my life. I have never once seen or heard of all of that work being done and the company just waiting on competitors before pulling the trigger.