The wood isn't the toxic part, its the phenols or oils which are. Those are cooked off in kiln dried pine. And yes those could be aspen shavings too. There are different grades of the stuff. There is shredded, chipped or shaved.

And to answer your question, the snake looks thin like mentioned but it doesn't look starved. The cage looks way too small for it though. Don't see any stuck shed or extra wrinkly like it is dehydrated but then again, the pictures are that great but overall, not too terrible.