No, Steven went up to Level 70's in Emerald.
The point still stands, though, that while he was champion (R/S), his Pokemon were not that high in level, so an unevolved Pokemon like Metang would not have been out of the question. Especially considering the previous two Elite 4 members had Sealeo and Shellgon on their teams. He could have mono-typed by that (or by having multiples of the same Pokemon as the Elite 4 before him did, again, Sealeo, plus Dusklops and Bannette, and Flygon as well in R/S). He did not do so and instead had three non-steel members of his team, two of which could not even learn Steel moves (Claydol and Cradilly). He did not use either tactic, which was used by other Elite 4 in Hoenn, nor did he use Mawile or Magneton which were both available, to create a mono-type team and instead has three non-steels.
Yet he is seen as a Steel Champion, nonetheless.
Steven (Steel-trainer) = 3 Steels (Metagross*, Skarmory, and Aggron), one non-Steel with a Steel move (Armaldo), 2 non-Steels without Steel moves (Claydol and Cradilly). Name apparently comes from Steel. Referred to as Steel trainer in-game.
Alder (Bug-user?) = 3 Bugs (Volcarona*, Accelgor, and Escavalier), one non-Bug with a Bug move (Bouffalant), 2 non-Bugs without Bug moves (Druddigon, and Vanilluxe). Name may come from "Alder moth." Not referred to as a Bug-trainer in-game.
Team-wise, Steven is as much a Steel-trainer as Alder is a Bug-trainer. The difference is Alder is not referred to as one within the game, so it is up in the air at the moment as to whether Gamefreak intended him to be seen as a Bug or Multi-type trainer. Unless the 3rd-game specifically refers to him as a Bug-trainer/multi-type trainer, or significantly alters his team to have more Bugs/non-Bugs, it will remain unconfirmed and the best guess would be "multi-type." But basing the idea on his team alone is incorrect.
* = Signature Pokemon
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