The word "literally" has been commonly used for hyperbole in English for hundreds of years. There is nothing grammatically wrong here.
> : in effect : VIRTUALLY —used in an exaggerated way to emphasize a statement or description that is not literally true or possible will literally turn the world upside down to combat cruelty or injustice — Norman Cousins
https://www.merriam-webster.com/dictionary/literally
They justify this in a few places, including
> The "in effect; virtually" meaning of literally is not a new sense. It has been in regular use since the 18th century and may be found in the writings of Mark Twain, Charlotte Brontë, James Joyce, and many others.
edit: HN was loading really weird for me, I didn't see the sibling comment make this point already!
Kelsey?