This is special share, could be named NWBW or something, it is separated from the Normal share. AMC just did that not long ago.
To make things worse for the naked shorts, make the record day same as the announcement day, these special shares cannot be traded but only can buy from the company, which is at price of $500/share. If there is 200 million naked shorts, then they need to buy 2 million special shares which will cost them one billion.