Hey Niklas,
At first glance, it looks like the plugin your posted uses a shortcode builder that is only compatible with the Classic Editor or Gutenberg so you can’t build shortcodes in Cornerstone.
Since it uses shortcodes, theoretically, it will still work within Cornerstone because you can insert the shortcodes in a Text element if your page was built using Cornerstone or one of Pro’s builders.
Please just note that we are not the correct party to answer how the WPSC plugin works. Please refer to the plugin’s documentation for usage instructions. Or, contact the plugin developer.
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Regarding Yoast, scanning the page you posted, you will need to set the options in the WordPress Page editor and not Cornerstone. Access the option via WP Admin > Pages > Edit.

Again, please remember that you need to forward any questions regarding third-party plugins to their respective developers.
Thanks.