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I’m happy to explain:
This code is our “honeypot”. It is hidden for sighted people with the CSS in the style attribute, and hidden to assistive technologies via aria-hidden="true". A bot fills out every form markup, including this hidden textarea. If there is content submitted in this field, we know it is spam, because no user (sighted or not) will recognize it, as it is hidden.
This is therefore a false positive, because it is the intention of this code to be hidden for everyone.
I hope this clears things up!
All the best
Torsten