Hi Peter,
To remove it from the code completely just go to theme main directory then inc > structure > content-extension.php on line no: 94 and 236
there you can see <div class="by-author vcard author">
and on line no:100 and 242
there you can see <div class="date updated">
remove these div tags as well as all the code inside it.
Note: Make sure to remove it via creating child theme so that your customize code won’t be lost while you update the theme to the new version.
Thank you!