This seems... not true, as https://www.sqlite.org/appfileformat.html indicates it "automatically coordinates concurrent access to the same document from multiple threads and/or processes" (search for: "Concurrent Use By Multiple Processes").

Yes, and you can only do ONE SINGLE WRITE PER MINUTE when using SQLite.

People need to stop believing urban legend or stuff that was half-true 15 years ago and test for themselves.