Why? It doesn't sound like that in the quote...
"It works on all the consoles… We’d like to see it happen, because it works, it’s how we made the game. I think it’s something really cool about what we do, but 90 per cent of our audience is on the consoles, so 90 per cent of our audience can’t even see this thing. So if we can solve that we’d like to.”
The full set of creation tools? Maybe not. Some form of an editor... Why not?
I still want to see the full quote in context though, if someone has the original source.
Well, because of the way bethesda builds its games, "The game", "The DLCs/Expansions" and "The Mods" are three names for what is, technically speaking, exactly the same thing - resources and plugin/master files. So yes, when he says "Mods could work on consoles", he's not lying. There's no technological reason stopping you from taking a mod and running it on a console, it's inherently cross platform.
What you can't do is do that and have it perform decently. The fixed hardware platform of a console is a double-edged sword - on the one hand, it lets you push the hardware as hard as it can go (but no further), giving you the best it can give while remaining at 30fps. This view of game development is inherently incompatible with bethesda games style modding! Because you're running everything up to the edge pretty much all the time, there's no room for additional content. Mods work on PC because it's been 6 years, and components are 20 or 30 times more powerful than they used to be (for the same price point), but obviously on console this isn't the case.
It boils down to, Consoles could load the mods - they couldn't run them. Stat alteration mods, perhaps same-quality retextures, but very little more. The real draw of modding is freedom, and putting it onto console would restrict it to the point where it was not the same thing at all.