Hi Hans,
Yes, the plugin hides shortcodes, that’s what it says in the plugin description alongside a brief info about how it works in general.
Removing shortcodes automatically from the database can be really dangerous and can cause a mess on your website.
The main purpose of this plugin is to be active once you switch to a new theme or working with another set of shortcodes. So it kinda helps you to keep your website clean on the front-end while you are working with the new theme or new shortcodes. Once you manually remove all of the old shortcodes, you can deactivate the plugin.
I would like to hear your opinion, please let me know if you have any questions?
Cheers