Glasgou is "whiskey national" and have obviously copy pasted some text from a single cask malt whisky bottle. Its probably not even whisky, it certainly doesn't smell or taste much like whisky but for 10 pesos i had to buy it for the name alone!
All whisky should be drank at room temperature as chilling it chills your tongue and thus you can't enjoy all the flavours the whisky has.
Also adding ice prevents you from controlling how much water is in your whisky, too much water and you drown it, losing all the flavours again.
Try it neat, then add a touch of water at room temperature until you get all the flavours in your expensive whisky.
Personally i find only a drip of water can completely change a whisky.
You wouldn't mix an expensive single malt with coke and you really shouldn't drink it on the rocks either.