I am going to do something silly here, and quote the rules.
To get a hardship waiver for an injury:
The injury or illness occurs before the first contest or date of competition of the second half of the playing season. In wrestling the first date of competition of the second half is defined as the 10th competition date for the team. Ferrari was 10-0 with all of his 10 coming in dual meets, the last of which was January 23, this was the eleventh competition date for the team.
The injury or illness occurs when the student-athlete has not participated in more than three contests or dates of competition or 30 percent of the maximum number of contests or dates of competition of the playing season. The maximum number for wrestling is defined as 17 and the 30% provision is defined as 6 in the rules. He is clearly over the 30% provision.
All that said, we have seen the NCAA lose a lot of court cases on eligibility issues, so who knows. But as the rule is written, he does not qualify for a medical redshirt, and he is not particularly close to the cut offs.