Define "real"

I guarantee it's not an official message from the company. If for no other reason, they explicitly stated the employees are expendable. Companies are never that forthright about that language.

But it could be a laid off manager griping, a laid off employee, and since it's on the outside of the story, anyone could have taped it up so it doesn't have to be actually related to being employed by Claire's.

Of course it could be also purely for the Internet.

So no, it's not 'real', is it digitally faked? Possibly but why bother, it's a piece of paper printed out and taped to a storefront, easy enough to just do it. Is it a sincere rant from an employee or a customer? Possibly. Is it purely a joke? I think this is most likely.