It is not unusual for schools to request copies of the actual tax forms along with the the transcript from the IRS in order to verify that the self reported information that the family places on the FAFSA and the profile is correct. Actually, it is now standard practice at most schools that you will have to turn in a copy of your IRS transcript (even if you used the DRT) in order to actually receive aid.
Why is this a surprise when the school clearly states this on their financial aid page.
https://www.wlu.edu/financial-aid/apply-for-aid/how-to-apply
If this is something that your father does not want to do, then you do not need to apply to this school or apply to this school with the intent of paying and not receiving any financial aid
University of Richmond’s financial aid deadline is November 15 for ED and EA (you are already late). To avoid a reduction in your financial aid award, in addition to giving the school what they are asking for, you should change your application to RD in order to avoid the 10% reduction in need-based aid.