Check if page is using Gutenberg, or if content is in a block?

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Hello, how could I make this function conditional to only run on the front end if the page isn’t using Gutenberg?

I just wanted to allow some html tags in get_the_excerpt on the archive pages.
But this doesn’t work with AB Post Grid Block.

So,

	function excerpt_allow_markup($text) {
        global $post;
        if ( '' == $text ) {
                $text = get_the_content('');
                $text = apply_filters('the_content', $text);
                $text = str_replace('\]\]\>', ']]>', $text);
                $text = preg_replace('@<script[^>]*?>.*?</script>@si', '', $text);
                $text = strip_tags($text, '<img>','<p>','<em>','<strong>','<h3>');
                $excerpt_length = 80;
                $words = explode(' ', $text, $excerpt_length + 1);
                if (count($words)> $excerpt_length) {
                        array_pop($words);
                        array_push($words, '[...]');
                        $text = implode(' ', $words);
                }
        }
        return $text;
}

remove_filter('get_the_excerpt', 'wp_trim_excerpt');
add_filter('get_the_excerpt', 'excerpt_allow_markup');

If I ask

if( function_exists( 'is_gutenberg_page' ) && is_gutenberg_page() ) {

It tells me

Call to undefined function get_current_screen()

I guess this function must be intended for the back end?

I thought if(is_archive()) should work too, but apparently not for this block.