There are a number of ways that a website can be hacked other than through a plugin, so just having a plugin installed on a website that then gets hacked doesn’t indicate that it had anything to do with the hack.
We took a look over the plugin and didn’t find anything in it that looks like it could have allowed what happened to your website to occur, so it is unlikely that the source of the hack was the plugin.
If the plugin was the source then there should be some evidence of that in the log files for the website.
If you find some evidence of an actual connection between the plugin and the hack then you should provide that to the Plugin Directory so that they can work to resolve the issue.