Hiding posts from main page/archive but not RSS feed

I’m trying to hide certain posts (either by ID or category) from my site’s main post list, archive post list, and the custom search feature, -but- I need those posts to still show up in RSS feed.

I’ve tried multiple approaches from articles/ChatGPT, but none have worked to hide the posts from the above locations. I’m stumped. It seems as if the add_action on pre_get_posts is just not working for some reason, but I’m not sure why.

Below are a few of the example code snippets I’ve tried in functions.php:

function myFilter($query) {
    if ($query->is_feed) {
        $query->set('cat','-1'); //Don't forget to change the category ID
    }
return $query;
}

add_filter('pre_get_posts','myFilter');

function exclude_posts_from_homepage($query) {
    if ($query->is_home() && $query->is_main_query()) {
        // Replace with the IDs of the posts you want to exclude from the homepage
        $exclude_posts = array(2324,2325,2327); // Replace with actual post IDs
        
        // Exclude posts from the homepage
        $query->set('post__not_in', $exclude_posts);
    }
}
add_action('pre_get_posts', 'exclude_posts_from_homepage', 1);