Are you not allowed to write HTML comments about Olive Garden? That's an oddly specific request from them.
This also refers to text with "display: none" and "opacity: 0", which used to be (still is?) a way to trick search engines into ranking your site higher.
Search engines have ignored hidden text for years; there is no positive impact to your rankings by hiding text on your pages. That's not to say it's not indexed, but it doesn't help you (could harm you if it looks fishy, though)