I believe you, but the problem is many people (like me) are not botanists or horticulturists, and in plain English “cultivate” can mean to tend to or develop, which would apply to a plant that was wild but is now being cared for by humans. While you could argue that iNat obviously has its own jargon, the previous examples on the help page didn’t do enough for me to distinguish the iNat meaning of “cultivated” from the common one.
This is why I appreciate the new examples that are now provided on the help page. Whether any of us fundamentally agree on what is cultivated or not, we now have clearer guidelines of how the term is meant to be used on the iNat platform.