Just checked with the team. The current intent has been to include both measurement systems in articles, blogs and pubs, but we occasionally miss that target depending on who the author is and which system they personally use where they live. We'll try to step up our efforts on this front to better reflect our entire audience. We may still miss at times, but it won't be through a lack of effort.
BTW, this doesn't mean that people posting here must use the same approach. Everyone is free to use either system, but incorporating both always helps increase understanding.