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In SharePoint 2010 site templates are saved as solutions in the site collection and have to be activated there before they can be used. You will have to deactivate the solution here before you can delete it.
Removes a deleted site collection. This cmdlet was introduced in SharePoint Server with Service Pack 1 (SP1) and SharePoint Foundation with Service Pack 1 (SP1). Use the Remove-SPDeletedSite cmdlet to permanently remove a deleted site collection from the farm.
How to uninstall Microsoft SharePoint Server Server 2013?
On the computer that runs SharePoint 2013, log on as a local or domain administrator. Start Control Panel. In the Programs area, click Uninstall a program. In the Uninstall or change a program dialog box, click Microsoft SharePoint Server 2013.
How to remove a site from sharepointserver farm?
Use the Remove-SPDeletedSite cmdlet to permanently remove a deleted site collection from the farm. Unlike the Remove-SPSite cmdlet that uses the host name and scheme for the Identity parameter (that is, http://server_name), the value of the identity parameter for all SPDeletedSite cmdlets use a server-relative URL.
When you save a site template, you create a Web Solution Package file (.wsp) is that is stored in the Solutions Gallery for further use. Only the current site is saved; not any subsites below the site. Navigate to the top-level site of your site collection. Click Settings and then click Site Settings.
Note: Moving site templates between different versions, such as SharePoint 2010 to SharePoint 2013, is not supported. Moving between SharePoint Servers 2013, 2016, and 2019 should work, though you may need to check the template to ensure it’s complete.
Who is responsible for delete a site template?
So you should be a Site Collection Administrator to be able to deactivate and delete Site Template that already used. Site Owners are responsible for one part of a Site Collection only, and cannot change anything on Site Collection level.