LOL - There wasn't anything about these that fits into any definition of a "standard" - yes, they were weird. I mean, c'mon - who thinks "white wine : mushrooms : Mexican"? Not anyone I know! (Ok, I did, but I don't usually.) But then, TB's Tex-Mex and Korean fusion didn't exactly jump out mentally as "oh yeah, that goes together" either, though it seems to have become a popular thing to do out that way. So yeah, gotta put the mental picture away and just give it a try. Was it good? I wouldn't have posted it here if it wasn't. It would have been one of those "yeah, we'll just not say anything and put it over here" dishes. But my son ate four of the enchiladas, so I guess he thought they were good, too.
Oh, and yes, there are Tex-Mex chicken enchiladas. Look up chicken enchiladas suiza, which has a sour-cream based sauce.