Here is a premise:
However, if auditors decide to perform their work in accordance with the standards for attestation engagements issued by the AICPA, auditors should apply the additional GAGAS standards for attestation engagements contained in chapter 6.

Here is a hypothesis:
If auditors want to perform their work according to the standards for attestation engagements, they should not apply the GAGAS standards.

Is it possible to conclude that if the premise is true, then so is the hypothesis?
no