Sun, if up, would have been to their right as they taxied up to the runway. As they turned on to it, the sun would have been to their left rear, mostly rear.
So, I'd say no, the sun was not in their eyes.
But the sun wasn't up, again according to the local station, sunup was 7:05, an hour later.
Given that, I'd have thought they'd have noticed the "no lights" before they turned on to the runway.