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Boeing, not Spirit, mis-installed piece that blew off Alaska MAX 9 jet, industry source says
(www.seattletimes.com)
This is a most excellent place for technology news and articles.
Here is the actual source quoted in the article: https://leehamnews.com/2024/01/15/unplanned-removal-installation-inspection-procedure-at-boeing/#comment-509962
OP's article is really weird, too. It mentions "a source told the Seattle Times", but...they didn't. The Seattle Times was reporting on a purported whistleblower posting to a public forum (what you linked).
This site could have reported the same source. It's like they only skimmed the article they're regurgitating.
I think there are two sources.
Also, the headline is completely wrong. The source claimed that a Spirit warranty team opted to go for a physically-impossible action and Boeing didn't stop them.
Thanks for that. A very interesting read; I am inclined to believe the author, given how they describe the failure of processes.