He is from China.

When Chinese is a noun, it can be translated into China, and this sentence can be translated into "He is from China", with or without "A". He is from China, and he is from China. When Chinese is translated into an adjective and China is translated into "He is from China", you can't add "a" because Chinese is translated into an adjective. So don't add "a". Chinese can be translated into: China, Chinese, China, Chinese, China, Chinese, Chinese and so on. I hope the landlord is satisfied. Please point out any mistakes.