It is right now at 18.5K and it spiked to 20K earlier.

BUT, comparatively speaking this is not that much. It is about 6.5 mln in swaps of shorts vs. currently 22.5 mln in longs. This is far from equal, but things indeed seem to be getting "there" (and healthier).
Moreover, I noticed that when market dictates, shorts are a lot more "flexible" in liquidating their positions than "to da moon people" (as someone else put it). So, in order for short squeeze to happen in the manner and scale the longs were squeezed previously, the borrowed BTC value probably should get to a much, much higher values.