@
yonkyunior - the original developer of the plugin,
kiwidude, is no longer active. But, thanks to other PI developers, his PIs have been maintained at least to the extent that they work with the latest version of calibre. In a few cases PIs have been functionally enhanced when a developer themselves had the need or felt otherwise inclined, such as the Modify PI
Some users will hack a PI to add, change and remove functionality for their own purposes, but choose not to make their hacked versions the 'official' version.
BR