OK, I use Flock Raiser also and had a fresh bag in quarantine out in the garage so grabbed the tag and took a pic....
....and found a pic of an old tag too, from 2014 when it had the 'sunfresh recipe', way different ingredients there.
Don't think they make the sunfresh recipe anymore, couldn't in find it on their website, but didn't look very hard.
Purina's website has always been heavy on marketing and light on real info.
I quit using this feed a year or so ago because of a massive infestation of grain mites coming in with the feed,
I have since gone back to it and just quarantine and treat each bag with DE while transferring to my feed bins.
Interesting to see DE in the ingredients of the latest bag...hmmmm, will see if I can find older bags.
Also did some googling...Aspergillus is a genus with several hundred species.
https://en.wikipedia.org/wiki/Aspergillus
"
Some species can cause infection in humans and other animals."
I didn't read the whole thing but I assume that other species do not cause infection....thus their inclusion in animal feed and probably many other uses.
Gotta be careful when reading Latin taxonomy binomial nomenclature not to jump to conclusions but look further to species.