OP, are you referring about brewing a mead with a Lager Yeast, or to actually lagering the finished brew, or both? To me, Lagering simply = "keep it in the cold for several months to condition before drinking it." The former idea, to actually ferment mead with Saccharomyces uvarum / Saccharomyces carlsbergensis, is actually a pretty cool idea (no pun intended...), and I can't think of any reason why it wouldn't work... Of course, you'd have to have a way to control your fermentation temps, as lager yeast works much colder than ale/wine yeast (Saccharomyces cerevisiae.)
Unfortunately the above linked thread is dead, and looks like no one followed through with actually performing the experiment, or at least didn't post back any results...at least it does give some ideas regarding yeast choices, and it does point out also that you might be limited in your alcohol tolerance with most lager yeasts compared to ale/wine yeast... If I had way to control my temps better, I'd definitely consider trying this...