Attributes/Options WYSIWYG not working

Please could you add an answer to your post because I am having the same issue but I see no solution to your problem.

Also I am not doing the post type in the code. I am using the UI. So where can I configure to remove the media box?

This is how you can remove your media from post editor and also the text tab where people can add html code.
Note!!! This will disable these options across the board. So if you need it to be post specific. Go find another solution.

Also I hope you have a child theme or else you are cutting corners and your stuff
will likely break with updates for your theme.

Paste the below code into your functions.php file inside your theme folder.

add_filter( 'wp_editor_settings', function($settings) {
$settings['media_buttons'] = false;
$settings['quicktags'] = false;
return $settings;
});