Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.
While these recommendations give you some general guidelines as to what settings you want to use in these more popular situations, don’t be afraid to customize according to your needs. For instance, if your Tier 1 will build only just a few links, you can set the 1st input to “Very Readable” or even “Extremely Readable” as WordAI will still produce unique content even if only a few versions.
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there
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