Is he going to register with the disabilities office for accommodations.
I would be honest and maybe also say something about virtual learning not being a good fit or something like that, but don’t make a big deal about it. They will see the grade drop. Better to be honest and it also provides some explanation for the grades.
Most people have had mental health issues in response to COVID. Doesn’t have to be a lifelong diagnosis. I am not sure I would even believe anyone who said they have been fine throughout.
ps just noticed the “optional” so also an option to skip it, but again, many experienced a grade drop and okay to answer if it does not portend similar struggles at college