I tried to follow your links, the ones on grains are behind a paywall... you should copy the key findings so we can read them.

whole grains seem protective enough that they save more than cause disease from toxins:

https://nutritionfacts.org/video/should-we-be-concerned-about-the-effects-of-ochratoxin/

And here is one saying that coffee toxin risk is over-blown or even a myth:

https://www.healthline.com/nutrition/the-mycotoxins-in-coffee-myth

Still I am not trying to dismiss this issue out of hand, it does seem like its a thing to pay attention to. I would just love to have a better sense of the levels.