Cannot get rid of CF7’s CSS injects

I virtually tried everything in regards to conditionally loading CF7’s CSS directives but to no avail…

I followed the offical docs and while the JS is removed just fine I can’t seem to remove the inlining of the CSS.

Tried the WP-CONFIG variant as well as the filters (they don’t even un-register the JS) and ended up with this:

/*
 * Disable CF7 outputting CSS / JS on all pages
 */
function remove_cf7_scripts() {
    if (!is_page(686)) {
        wp_deregister_style('contact-form-7');
        wp_deregister_script('contact-form-7');
    }
}
add_action('wp_enqueue_scripts', 'remove_cf7_scripts');

But that won’t remove the CSS being output. I am talking about this passage in the HTML markup:

<style type="text/css">
  div.wpcf7 .screen-reader-response {
    position: absolute;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    height: 1px;
    width: 1px;
    margin: 0;
    padding: 0;
    border: 0;
  }

  div.wpcf7 .form-inline img.ajax-loader {
    display: inline;
  }

  div.wpcf7 .ajax-loader {
    visibility: hidden;
    display: inline-block;
    background-image: url('https://querstadtein.org/app/plugins/contact-form-7/images/ajax-loader.gif');
    width: 16px;
    height: 16px;
    border: none;
    padding: 0;
    margin: 0 0 0 4px;
    vertical-align: middle;
  }

  div.wpcf7 .ajax-loader.is-active {
    visibility: visible;
  }

  div.wpcf7 div.ajax-error {
    display: none;
  }

  div.wpcf7 .wpcf7-display-none {
    display: none;
  }

  div.wpcf7 .placeheld {
    color: #888;
  }

  div.wpcf7 .wpcf7-recaptcha iframe {
    margin-bottom: 0;
  }

  div.wpcf7 input[type="file"] {
    cursor: pointer;
  }

  div.wpcf7 input[type="file"]:disabled {
    cursor: default;
  }

  div.wpcf7 .form-inline .form-group {
    max-width: 250px;
  }

  div.wpcf7 .input-group-addon img {
    height: 100%;
    width: auto;
    max-width: none !important;
    border-radius: 5px;
  }

  div.wpcf7 .input-group-addon.input-group-has-image {
    padding: 0;
  }
</style>

How come? Am I missing something? Any ideas?

Thanks for providing such a great plugin, much appreciated!!