Nowadays a publisher will have produced one computer file for a publication and that will be sent to the printer and be printed without any further processing. The same file will also be the source of the digital version. So where it is printed is immaterial.
Text does not need to be typeset, so no errors are introduced at that stage. In fact the author has probably submitted the text to the publisher as a computer file.
I edited a learned journal for quite some years. Everything from editing to proof reading was done by volunteers, albeit some of us had publishihg experience. We had a whole team of experienced proof readers and proof reading took a long time - and mistakes still got missed. The cost of proof reading, had we been paying for it , would have run into thousands.
The problem with many magazine articles, is, as suggested, the excessive reliance on spell checkers, but also often the junior staff given the job of preparing the text for publication do not know much about the subject of the article.
I picked up a house magazine in Smiths once,that had an article about fireplaces in old houses and mentioned the 'bressumer', which is the big wooden beam you see going across the top of the fireplace in cosy old country pubs. The article had been run through the spellchecker, which not recognising the word had replaced it with something entirely different that had absolutely no connection with fireplaces and was absurd in context but the junior concerned had done nothing about it because, presumably, she knew nothng about the subject of the article. The magazine was printed - and the editor had to publish an apology in the next issue, because so many people contacted them about the ridiculous mistake.
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