I just mean in a general sense, like, often publishers do want their product priced the same on competing marketplaces (related to what @Baines was saying), but that’s clearly not entirely true during sales, as sometimes a product will be cheaper on one marketplace or another. If you had a game that was on both Steam and Epic, and were selling it for say, £20 on Steam, that makes the publisher £14, but they could sell it on the EGS for £17 (which would presumably move relatively more copies - not absolutely more because far fewer* people use the EGS as yet), and make £14.96. This wouldn’t “devalue” the product in the same way a lower price permanently in the EGS would, I suspect.
Still… it’s a slim chance, and until it actually happens, Sweeney is talking smack.
- = Given Sweeney said 85m people are registered on the Epic store, but also said 4.5m people picked up each of the last two free games, clearly relatively few people who are registered are actually interested in using it to get PC games (presumably they’re there for Fortnite and no other reason).