The chapter people cite is The Prince, chapter 18, “Concerning the way in which princes should keep faith” — the fox-and-lion chapter. It is genuinely about deceit, and it is genuinely ruthless: “a wise lord cannot, nor ought he to, keep faith when such observance may be turned against him.” But nothing in it reads like the quoted maxim, and Marriott’s translation does not contain the word deception anywhere.
A full-text search of book databases turns up no printing of either wording before the 1982 essay, and the “deception” variant does not surface in books until the 2010s — which is consistent with an internet-era mutation rather than a lost translation. Treat that as a floor, not a proof: absence from a search index is weaker evidence than the direct textual check, which is why the textual check is what this page rests on.
There is one more strand worth separating out. Epstein’s essay also quotes Sun Tzu’s “All warfare is based on deception” a few paragraphs later, and the two lines have been travelling together ever since. They are different sentences by different people, and only one of them is real.