We've known this for a while but yeah. I know it's only temporary, but I've noticed a heap of big tv events and specials are beginning to air more and more at varied times and outside of the primetime Sunday slot which is strange to me.
Tbh the real reason is most likely The Walking Dead premiere, it wouldn't be out of the question that TWD would score higher in the 18-49 demo and I'm sure Grammy execs would find that embarrassing.