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After a couple false starts I really am #CurrentlyReading "Security Chaos Engineering" now, and I can tell it's written by engineers because they think "This" is a noun.

Don't use "this" as a noun in writing!

Since engineers love to do so: "this" is an imprecise back reference. In regex, you must be precise with them: \1, \2 etc. In writing you don't have that luxury, so use your words to be precise. "This" as a noun works in inline comments, but in writing the reader needs more context.