I don’t like being ‘that guy’ but from what I have read, the mycotoxins in dead spores are still toxins.
This is an article with plenty of references if you want to go down a rabbit hole.
https://inspectapedia.com/mold/How_to_Kill_Black_Mold.php
The thing is, I am sure most of us that have smoked non-tested bud have at some point smoked some mold spores in our buds. Spores are everywhere. It is probably TLV(threshold limit value) dependent. I like many on here have trimmed off bud rot and used the bud that didn’t have rot on it. I think it is wise of you subbie to keep this away from your son-in-law though.
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