I just have looked of the following information. Does the following sentence wrong? "If you not got a job, what would you do? "If you did not Have a job, What would you do? <=Is this very old fasion sentence?
No, you cannot omit the auxiliary do in a sentence like If you did not have a job, what would you do? The proposed sentence If you not got a job, what would you do? is incorrect.
You can, however, contract the words did and not into the contraction didn't, to form the sentence If you didn't have a job, what would you do?
Contractions like didn't are very common in spoken English and informal writing. In formal writing, they are more likely to be avoided (opinions vary on whether or not they are appropriate).
Using did not instead of didn't in casual speech would make it sound a little more formal and perhaps slightly old-fashioned, but not excessively so, in my opinion. I think the passage you quote is an exaggeration.