I don't know who published that "best practice", but they are factually incorrect for the reasons stated above. I can't think of a valid reason to disable the page file in a Windows server at all. If your VM is heavily writing to the page file, you either need to add memory, or there is an application that is poorly written, and disabling the page file isn't going to prevent those issues. Apps like SQL Server look for page file space to claim (even though it isn't active paging), to use in case it is needed.
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