Don't depend on this. It only shows the general trend in which bitcoin is at the moment.
During this recent bull run it was showing extreme greed a couple times and the price went up regardless, so the fact that it's showing extreme fear doesn't mean that it can't go lower.
A small recovery is what traders call a relief rally and it doesn't mean a trend reversal. We haven't even hit the price we were at before the big drop which is 42000.
This is a good point. On the other hand, who is left as sellers on the market? Long positions were liquidated, panic selling wiped out most of the people who were in a loss. The only credible source of sales pressure would be Chinese miners due to the new regulations. But they are still accumulating more than they are selling.