That is an old myth, call your broker and they will set you straight on that. Shorts are not owners of the stock, longs are, shorts only borrow the stock from the longs, so if the long wants to sell their position the broker will force the short to cover, that is where the term short squeeze comes from. In the meantime a GTC Good Til Cancel order does not stop the stock from being shorted. A lack of actual available stock does prevent the stock from being shorted, like is the case with this stock.......It is HTB......Hard To Borrow because of the low float.
And I'm betting at many, or all other brokerages. Where do people get very low float stocks to short? They just like to hear themselves babble. And it's always the same posters that go from message board to message board with the same exact vomit.