I don't know. The Wikipedia article is pretty short and sparse. There is a short list of "examples of alleged predatory pricing," but that doesn't seem to support the certainty with which the economic theory is generally presented.
Even in non-empirical economic theory, the idea doesn't sound particularly obvious or sound to me. Obviously predatory pricing by a large firm can drive small firms out of business, but the large firm doesn't actually make profit from that until they raise their prices again, which sends a signal to others to start competing. And yes, there are barriers to entry, but it doesn't seem like the resources a small firm spends to enter a market would be destroyed when that firm gets driven out of business by the large firm's predatory pricing. Assets will get liquidated, sold to someone else, and potentially used to start competing again when the large firm raises its prices.
