I think some of these out of scope defintions are somewhat straw man arguments, just as there are multiple views and contexts of historical events so people will take different views of history and how it relates. Following the historical record of the Granny Smith, in some ways, doesn't seem as wildly off-topic than the oldest extant civilizations, cultures or religions. They all have a historical context, in many ways it depends on your view of it. We DO need to limit scope on questions, but if someone has taken time to try and follow the path of something using original sources, or trying to track how fruit, people or religions have pollinated themselves around the world then I don't see it as off scope. Maybe it's limited but I don't think it's that wildly off topic for history, after all we have discussed how the American continent was discovered and colonized, or how firearms have changed history - the path of fruit is hardly that far outside the historical record if you want to try and follow who and when a species was brought somewhere. Otherwise the question on who brought non-native species to a country, continent and why will be off-topic as well.
For the record, I was amused at the question, I'd have nothing to add nor would I have answered/commented but I don't think I would have closed it.