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Believe me, Charlie, it's real! As you can see, three answers above yours say Epson printers will work ONLY with Epson ink in them and two say OTHER cartridges also work.
Accordingly, I cannot imagine why you might think the question is some sort of joke. Obviously, putting Epson ink in will do the trick, but it's relatively expensive and the word, compatible, actually means something. Presumably those selling "compatible" cartridges which aren't compatible are doing so under false pretences.
Thanks to the rest of you for your responses. (I'll tell madam about your suggestion, K.)