They have 2800 employees with 5-10 reports per manager.
Gitlab is a really big conglomeration of services and daemons and tools written in multiple languages. It's approximately an order of magnitude more complicated than the relatively straightforward and (IMO) well designed Phabricator architecture.
Eight layers total
The GP miscalculated it.
I wonder if they have 5-10 employees per manager at the bottom of the org chart, but a lot of middle managers and manager-like titles mixed through the middle.
If anyone has a VP-level position open, I'm willing to send you my resume. There is a salary level at which I am willing to do work entirely without shame.