Hummm ...
Lawsuit: Sig Sauer pistol fired without trigger pull
A Hillsboro man is suing Newington gunmaker Sig Sauer alleging his Sig P320 pistol fired, without him pulling the...
www.seacoastonline.com
You would think the US Navy and Marine Corps would have found such an issue since both armed services have transitioned to the Sig M18 pistol.
The article claims that the gun went off while the man was removing an IWB holster.
Here's a link to the actual complaint in OP's post. All of the complaints alleging this issue are probably very similar, except for the alleged facts specific to each individual case:
According to statements #3 and #13, the pistol fired while he was simply removing the holster from his body. Didn't say anything about the pistol was being pulled out of the holster when it fired.