I have been following this as well. We are short on details. There are some odd bits that need explaining. Glad he's alive.
And glad that he found his way to workers who had been working in the area for a whole week before, up and down the road with quads etc. Right after he was picked up, the temps dropped to -30C.
We also know there was a substantial official search but it's big country. His family stayed longer and kept searching.
We know that he left his car and made a shelter, and had fire, and was eventually injured when the shelter caught fire. Obviously if he's alive after 50 days he had some survival skills.
No information on signalling efforts. I'm sure better information will emerge.