Assuming that this– add_filter( 'kandombe_theme_thumb', 'kandombe_lazy_loads');— is the line/hook you are talking about.
You don’t hook to functions. That is not how it works. Hooks have to be intentionally created with apply_filters or do_action. Your code would have to be written like this for that to work:
function kandombe_theme_thumb($id, $width, $height, $align='') {
//some code
$html = apply_filters(
'kandombe_theme_thumb',
'<img class="archive_thumb" src="https://wordpress.stackexchange.com/questions/105361/.$image_url." width="'.$width.'" height="'.$height.'"/>'
);
return $html;
}
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