It would be great if you post this topic in the specific section of the community. Maybe Help & Support fits better with you question.
Regarding it, I am sure Darwinex staff can answer you better than me, but anyway, effectively you are right. To create a Darwin, you must have more than 50% of trades above 10 minutes.
As far as I know, they are working hard to take out this restriction, analyzing data with a timeframe below 1 min, that will result in not having this limitation, but for now, it is that way.