Hi, first of all you need to check the site’s page source in logged out state. Also, you can replace ant word/text in the page source using HMWP’s “replace in HTML”, but it’s not recommended to replace CSS class names and IDs as it might break the site. If you want to replace then you’ll have to replace one at a time (should not replace “wp” in one go but the whole word like wp-abcde), and check if anything breaks after replacement.
I understand your concern but word “wp” alone cannot be replaced as it will replace any occurrences of text “wp” in the site and hence will break the site. As of now, replacing the words containing “wp” one at a time is only the solution in the case like this.
And as mentioned above, please check the site’s page source in logged out state.