They have a clue…probably had a clue before they shipped. I chat up the engineers where I work and they always figure out the what, how and why somethings fucked when more than expected failures pop up on a wafer or God forbid in the customer’s production units like a car or radar or medical equipment.
I think meta claimed around 5Gbps but real-world people saw around 2 - 2.5Gbps for quest 2.