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It seems that when you install Yoast SEO a few lines are added to the source of the website/webshop.
<span class="updated rich-snippet-hidden">2024-01-18T16:07:13+01:00</span>and this on its hand seem to tell Google when the page was last updates. But for the homepage this is less relevant than for a blog. But now Google display’s the last updated for the frontpage and other informational pages.
I tested this with a shop with Yoast and a shop without Yoast but am not 100% sure that your plugin is adding this code to pages (it seems fair that this code is added to blogs/posts).