38 North purchases the satellite images from a commercial vendor and does their own analysis. They have been keeping an eye on Yongbyon for quite some time. However, you gotta take any analysis they do with a grain of salt because ever since the demolition of the Nuclear sites they have been suspicious of NK and are on the lookout for any sign that they will reneg on their agreement.
I'm sure that POTUS and our Intel community knows EXACTLY what they are doing there. These headlines are sensationalist in that they have NO idea whatsoever whether they are upgrading the reactors or not based on these images. All they see are a few new outbuildings and some earth being moved and suddenly that turns into they are upgrading the reactors… please.