I would disagree that this poster used 'excellent English" here. Rather, it makes a good, and obvious case why native speakers preferred.
The poster makes numerous english language mistakes in simply asking a question.
Below are the mistakes:
1.' specifically English & Math subject' (?)
2. Infact
3. I am scheduled to take a crash lessons in Mandarin language (?)
4. NATIVE SPEAKERS are the ONLY qualified children of GOD in all of the job openings for english teachers (in China.. that is)
In this sentence English is not capitalized by the poster, and these constant religious references and constant fascination to all things God are just strange thinking, and not normal to the rest of the world. Being a native speaker is about ATTITUDE and THINKING, too.
5. available in the web-This preposition is WRONGLY used, a common problem with English in the PI. Students do not want to learn wrong preposition usage.
6. were doing fine and liked by the (?)
7. I am planning to apply as english teacher. Again no capitalization for English and no article 'an' before english teacher.
8. Face reality- your English is not good enough, find something else. How can you in good conscience think you can teach English when absolutely essential parts of your English are wrong ?

Armed with a degree in Psychology and proficiency in the English languag
e, plus experience in tutorial jobs - specifically English & Math subject and to top it all a cerificate of TESOL, I am more than willing to teach in China as an English teacher. Infact I am scheduled to take a crash lessons in Mandarin language... however as I browse and surf the internet, a pinch of discouragement hit me... NATIVE SPEAKERS are the ONLY qualified children of GOD in all of the job openings for english teachers (in China.. that is) available in the web. Although some of my acquaintances who have friends in China.. hired as teachers were doing fine and liked by the Chinese schools where they worked. I simply do not like my mind to be corrupted by the fact that being a second language speaker of English will hinder me from applying in China