Read what I said; I didn't say that Rogue had no RNG. I said that roguelike is not meant to mean any game that uses RNG. RNG is common is many kinds of games, we don't call a game a roguelike just because it has RNG. Video poker has RNG. We don't call videopoker a roguelike.
Doom had monsters. We don't say that any game with monsters is a Doom clone. Games are only Doom clones if they have more in common with Doom than merely having monsters.
Roguelikes are dungeon crawlers with random procedurally generated levels, played on a grid with discrete turns and permadeath. The more of these characteristics a game has, the more roguelike it is. There is some flexibility in the meaning of roguelike, room to experiment with the format for instance by using a hex grid instead of square, by loosening the turn-based constraint or even using non-euclidean geometry. But merely having RNG does not make a game roguelike. If having an RNG is what it means to be a roguelike, that makes any game played with dice or a shuffled deck of cards into a roguelike. Is Scrabble a roguelike because you draw random letter tiles and play it on a grid? That's obviously not what roguelike means.
