The lawsuits won't hold up. These "ambulance chasers" are usually looking for investors who've lost $50k minimum; and in the investing world the cliche is, "you only lose if you sell". So anyone who has sold for a loss based on a short sellers tactics, it's their own fault. Additionally, another reason the "lawsuit(s)" won't hold is because once the stock price recovers, that's evidence that whoever sold should have held, as the price recovered making ones "loss" a mute point thus going back to the cliche, "you only lose if you sell".
It's not even for sure that the DOJ or SEC are investigating NKLA as no party has confirmed nor denied it, but if they are being investigated and the investigation comes back clear, you will see NKLA quickly hit the high of the day when the GM partnership was announced...$55