He still supports a public option, he just opposes M4A because it would end existing employer-provided healthcare. Not everyone who opposes M4A is right-leaning, sometimes they just don’t think that this particular model is better than other public option models.
The Green New Deal faces lots of opposition from those who agree with the sentiment, citing it as misdirected, expensive, or overly ambitious. He does generally support the move to renewables.
Additionally, he supports expanded drilling, in parallel with a move to renewables, to reduce our oil imports. We can’t just snap our fingers and transition to 100% renewables overnight. It will be a gradual process, and reducing our dependency of oil imports is very possibly a pragmatic step in that process.
Policies are rarely black and white. It would appear most of his positions which seem, superficially, to be negatives are held for relatively nuanced reasons. We could do worse.