Sample way to delete post tags by ids (export from Google Sheets with rows)

functions.php

<?php

// Step 1: Copy all Google Sheets' row and process to only number with commas
// It looks like
// 197
// 112
// 256
// https://www.browserling.com/tools/text-rows-to-columns
// Step 2: Open with any IDE such like Visual Studio Code to remove all whitespace, eg: "192 ,91" => "192,91"
// Step 3: Place a term ids list replace $$raw_term_ids to remove it.

add_action('wp', 'process_delete_post_tags', 100);

function process_delete_post_tags() {
	if ( is_user_logged_in() && !empty( $_GET['process_delete_terms' ] ) ) :
		$raw_term_ids = "197,112,256";
		
		$term_ids = explode(',', $raw_term_ids);
		
		wp_defer_term_counting(true);
		
		$success = 0;
		$failure = 0;
		foreach ($term_ids as $term_id) {
			$result = wp_delete_term( $term_id, 'post_tag' );
			
			if ($result) {
				$success++;
			} else {
				$failure++;
			}
		}
		
		wp_defer_term_counting(false);
		
		echo '<pre>';
		echo 'Success: ' . $success . PHP_EOL;
		echo 'Failure: ' . $failure . PHP_EOL;
		echo '</pre>';
		
		exit;
	
	endif;
}