Hi, yes, this plugin and all my other plugins are available for commercial use with credit. All of my resources will have any extra terms of use visible before download. As a general rule, if you don't see any extra terms before download, then there are no extra terms for that resource.
The note about some having extra terms is there because I have started to commission some of the art resources posted on my website to artists in the RPG Maker community, and those art assets require Casper Gaming credit + the artist who drew them credit which is noted before download and in a txt file with the download.
I code all the plugins by myself so they don't have any extra terms.