The really astounding part of all this is that hobbyists have been monitoring the exact orbits of all the US spy satellites for years. They know exactly where they're overhead and when. That kind of capability used to be something that only a handful of states had, and now people just do it from their homes and post it to the internet.
For a bit more corroboration of that analysis, this is what SunCalc says the sun direction would be at that time (9:44:20 UTC, 14:14:20 PM local time) pinned at the base of what (i believe) is that specific launch pad. Elevation of the satellite will affect the apparent angle some, but this is pretty convincing: