it means that 50% of a huge amount of money flows into
BTCgreat news, good luck to the shorties

Im sure less than 1% of the mined bitcoins are short, there is not many means of doing so.
well, many people are not really short but sold a la baisse, hoping they can buy back in lower
that will also lead to quite some squeeze if price goes up instead
That isn't a squeeze. Squeeze's occur when people have no option but to cover a position to avoid a margin call. People hoping to buy at lower prices just means prices will continue to trend down until there is an explicit reason to buy.