A bit down the page on the right, you'll see "Shares Short", "Short Ratio", "Short % of Float", and "Shares Short (prior month)".

What that is telling you is that almost $10B of Tesla stock has been borrowed and sold (with the profit coming from buying in the future at lower prices, ie, betting against TSLA). That is increased about 7% from the prior month, and would take almost 5 entire days of average trading volume to close out all the short positions.

This is a high level of betting against a stock by any standard.