Hey there,

I am really sorry for the delay of this reply as it is a public holidays for us here.

Currently Komento do not have an option to turn off this, but you can modify these following file.

JoomlaFolder/components/com_komento/themes/wireframe/comments/item.php
JoomlaFolder/components/com_komento/themes/wireframe/helpers/user/avatar.php
JoomlaFolder/components/com_komento/themes/wireframe/helpers/user/avatartext.php
JoomlaFolder/components/com_komento/themes/wireframe/html/avatar.php
JoomlaFolder/components/com_komento/themes/wireframe/html/name.php
JoomlaFolder/components/com_komento/themes/wireframe/ratings/overall.php