Sure, but they probably took 3 years to have a design review, an executive review, some firings and layoffs, re-hire, orientation, a sprint planning meeting, a sprint retro, a post mortem, an OKR meeting, a KPI meeting, an all-hands, and then the cover probably got stuck in customs with tariffs, and then the tolerances probably weren't correct.
And eventually be missed/ignored by a rushed ground tech and fail again.
Other than making it easier to blame someone, labeling is just a short term interim fix for such things. You design it to be physically impossible or as close to that as possible.
Been there, done that in much less high stakes environments. Upping the training, documentation, and labeling simply makes the mistakes happen less often for a physical process obviously prone to a common mistake.
Sure as an immediate airworthiness directive giant bright lettering is a great immediate “this month” fix. Certainly not a permanent one though.
If you make a hole multiple things can be fit into, eventually someone will try.
Meanwhile the sharpie would take 1 minute.