This is the (only) relevant bit in the article:
Important: If a website doesn’t have an encryption icon, the words “Not Secure” appear in the Smart Search field. Don’t enter personal or financial information on a webpage that isn’t encrypted. The website you’re visiting might not be the website you want, and information you enter is vulnerable to theft. Instead, go back to the page where you logged in and check for a link to another version of the site that’s encrypted—for example, “Use our secure site.” If available, use it, even if you don’t expect to view or provide private information.
Reading between the lines of the above, it appears that I simply can no longer use Safari to get to the Hunger Site, as the site is apparently not encrypted? I note that the site isn't requesting my personal or financial information - it just wants me to click a button to make a donation. It seems sad to me that I can't donate anymore because Apple wants them to encrypt a site that doesn't need encryption.