Hi Frank,
Well, it is dynamically generated, so it may change depending on the features you enable in the plugin settings. In your case this is the current file:
https://www.abena.nl/wp-content/uploads/asp_upload/style.basic-ho-is-po-no-da-au-ga-se-is.css
You could try this dynamic file name as well, wp-rocket should recognize it:
/wp-content/uploads/asp_upload/style.basic-(.*).css