This is autoblogging. This won't work. Google will see the blog theme fingerprint and will either lessen the index or de-index. Also, the dupe content is another factor that gets you de-indexed.
Now if they used a generic, common theme, and different themes; and then if they used unique, synonymized content -- these things would perhaps get past the Google filter unless of course something triggers a manual review at Google and a human checks it.
A site has flags at Google (that's the theory) and if you throw enough flags, then it sometimes triggers an automatic de-index or PR lessening. In some cases, and again this is all theory, it triggers a manual review and they have a human review what's going on to see if they need to alert the core team on a search engine tweak.
Now if they used a generic, common theme, and different themes; and then if they used unique, synonymized content -- these things would perhaps get past the Google filter unless of course something triggers a manual review at Google and a human checks it.
A site has flags at Google (that's the theory) and if you throw enough flags, then it sometimes triggers an automatic de-index or PR lessening. In some cases, and again this is all theory, it triggers a manual review and they have a human review what's going on to see if they need to alert the core team on a search engine tweak.