Scientifically, intelligence requires organizational complexity. And has for about a hundred years.

That does actually disqualify some mechanisms from counting as intelligent, as the behaviour cannot reach that threshold.

We might change the definition - science adapts to the evidence, but right now there are major hurdles to overcome before such mechanisms can be considered intelligent.

What is the scientific definition of intelligence? I assume that is it is comprehensive, internally consistent, and that it fits all of the things that are obviously intelligent and excludes the things which are obviously not intelligent. Of course being scientific I assume it is also falsifiable.