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.

Does your website need quality content in numbers? The truth is; producing articles restrict the amount of content that is written on your site if you’re the only one writing on your website and can take any author hours. Hiring a writer can get expensive. Have you ever considered using an article spinner? Spinning content is a excellent way to keep your website fresh and relevant . Needless to say, not all article spinner applications is great. Therefore it’s important to do your homework first. We propose Spin Rewriter 9.0. You can rewrite your articles using their Rewrite system. In addition, you have a Bulk Rewrite option that lets your rewrite articles with one click. You break it up into several terrific pieces of content and may take one article. The choices are endless.
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Spinnerchief.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Spinnerchief.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.
Think of it this way: What do you have more chance of hitting, a distant, tiny target or the broad side of a barn? For the sake of search engine optimization, you want your website to be the broad side of barn. The more quality articles, or unique readable content, your website or blog offers to search engines (and therefore the general public) the more exposure your website will receive from major search engines.
Unlike other spinners, WordAi fully understands what each word content means. It doesn’t view sentences as just a list of words, it views them as real things that interact with each other. This human like understanding allows WordAI to automatically rewrite entire sentences from scratch. This high level of rewriting ensures that Google and Copyscape can’t detect your content while still remaining human readable!
Open Graph description is not detected on the main page of Spinner Chief. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML tag will help to represent this web page correctly in social networks:
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Now, remember that the above example was using the “Very Readable” setting of WordAI. Let’s see what content will be generated if we use the “Readable” setting. Just a quick note here that this time it took about 20 seconds for WordAI to finish the spin, so the setting we are playing with definitely has some effect and is not there just for marketing purposes:
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