Enabling Google and Bing ping

Hi again,

https://wordpress.org/plugins/xml-sitemap-feed/#faq
says:

Does this plugin ping search engines?

Yes, Google and Bing are pinged upon each new publication. Unless you disable this feature on Settings > Reading.

First, I think it should be “Writing” not “Reading”.

But also when I found it I am not sure: Is the checkbox at the top meant for this so having checked this is enough — or do I have to add Google’s PING URL at the bottom textarea too? See screenshot:
https://screenshots.firefox.com/ySo7izKONXicvb0e/fr.test