Thanks for the clarification.
In order to be eligible to apply for an F-1 visa, the applicant must be enrolled in a degree granting program and he must have an I-20 issued by the school. So as you can surmise from this, if the school accepts him for enrollment in the program based on his past education, and they issue him an I-20, then he is eligible for the F-1 visa.
The US government doesn't have jurisdiction over educational institutions, to the extent that those institutions decide who they will accept for their programs, and if they decide to issue the I-20. That is for the institution itself to decide. So if they enroll him and issue him an I-20, then he should be find to get an F-1 visa.
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