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I hope you are well today and thank you for your question.
The plugin searches post types on the site which is default functionality of WordPress search. It doesn’t change default functionality of WordPress search and SKU is not post type but custom field so it doesn’t get searched.
The main objective of plugin is to just add search form in the site navigation menu and not change any other search functionality so you can use this plugin to add search form in the site navigation menu and to control search results, you can use any other WordPress search plugin.
Thank you for spreading the word of plugin to your friends.