If that option didn't help, please go to Admin > Components > TZ Portfolio > template styles > select the one assigned to the article > delete the block "Author" in layout builder.
Please try with it and kindly let us know if it works
To remove the message of super user in each article, please go to Admin > Components > TZ Portfolio > article
Open each article, navigate "Option" on the right sidebar, then hide the sub-option "show author"
Please try it and let us know