False. Google will do whatever it wants to. It can crawl a page externally by means of a new social share ping or through a “new link” it discovers. But if we HAVE to touch a high-ranking post ourselves, using a tool like Limit Modified Date which prevents your blog from updating the Last Modified Date schema on the page an in your sitemap is a way to “insulute yourself” a little bit from unnecessary crawls by Google. So if you have to touch a high-ranking post to make a change, this “could” help Google NOT recrawl that page needlessly.