The suite's Display template sets contain a template recordEditLine and so there should be one of those for this template set to. I'm fairly sure that the lines
<strong>{lang="date_edited" htmlsprintf="\IPS\DateTime::ts( $record->record_edit_time )->html(FALSE), htmlentities( $record->record_edit_member_name, ENT_QUOTES | \IPS\HTMLENTITIES, 'UTF-8', FALSE )"}</strong>
{{if $record->edit_reason}}
<br>{$record->edit_reason}
{{endif}}
are what's producing what you see there, so it might be worth going to the recordEditLine template which this plugin uses, deleting that text, and then seeing whether that solves your problem.