Or operators in PHP [closed]

try this

<?php if ( (! is_page_template('modelPages.php')) || (! is_archive()) || (! is_single) ) { ?>

Think your ‘not’ ! is causing the issue.
btw, you could move it to this

<?php if ( !( is_page_template('modelPages.php') || is_archive() || is_single() ) ) { ?>

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