Hello,

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Check this Product:
https://appapop.com/product/sydeus-textured-pantsuit/

The Disabled Swatch style is for the variants of the Products which are disabled not for the Out of Stock variants. So, you need to have the variant of the Product not checked with the Enable option on it and then the Disabled Swatch style will work accordingly. See these images for reference:
https://snipboard.io/BMehIF.jpg
https://snipboard.io/NbOzfP.jpg

Best Regards.