If you can smell something, part of it is airborne. Pretty sure I know what peanuts smell like.

I’ve been on a lot of flights and never been served peanuts since the 90s. I was under the impression they did not serve peanuts on flights any more but those stories you linked say otherwise, but of course you can’t stop people bringing their own.

I think you have to speak to a doctor and maybe see what the options are.