The problem with post quality checkers is that there is no way to objectively determine post quality. That site uses the length of the post, but that does not always indicate the quality. Some long posts are really bad quality and some short posts are enough to answer the question. The only real way would be to create an AI that can judge post quality, but that is way overkill for something like this.
not even an AI could work the thing is very subjective, and no ai can pass the tuning test at 100%
also there are many way to abuse the system that sometime not even an human can notice let alone an ai
for example, i've spotted(not sure) some user who copy-paste(plus some modification) a very old post because no one will ever check for it, this can be done easily if the argument is reiterated after a long time, because everyone will forget about it...
