I simply don't get the use of the word "considered".
In New Zealand , Australia, UK, lemonade IS a carbonated beverage. It is carbonated and sort-of lemony, vanilla and sweet.
In America, they seem to call water with lemon in it "lemonade". This is a completely different drink, which shares the same name in the different region.
.
So clearly an Ozzie will tell you
Yes, of course, lemonade is a carbonated beverage. Carbonated beverages are bubbly, like sparkling water.
(there is no "soda" there. It's an American word. Soda water is carbonated water))
While an American would presumably say
(Oh look, Sarah said it).