If a buyout offer was announced suddenly, 100% of the short interest would have to cover and it is possible the stock price could temporarily exceed the buyout price. Since a buyout is a possibility, this risk must be considered by short sellers. The potential gain from selling short is about $4, while the potential loss is something above $30.
I am just pointing out the risk reward ratio. I do not believe a buyout will happen this year. The production lab expansion and new employees are there to support commercial activities. If there is a buyout, the current facilities would be moved into the acquirer’s building.