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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.
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.
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.
I think there are two sources.