Boeing is having a rough time of it right now, with parts falling off its planes left, right and center. Just last week, a wheel came loose and smashed through a car, and earlier this year the door from a 737 Max aircraft broke off mid-flight. That mid-air disaster sparked an audit from the Federal Aviation Administration, which has gone far from well.
I fully agree with you, the keycard itself isn’t the main issue, the lack of documentation and standardization is.
I read the article as if it said that the workers at the floor had a bunch of random keycards they used for fit testing.
If it was standardized on specific keycard blanks I would have zero issued with it.