Correct, but it's not "lighter and creamier" because some fairy waived it's magic wand over it. It's "lighter and creamier" because it's pumped full of tiny nitrogen bubbles. So, you are not buying 2L of ice cream. You are buying about 1.5L of ice cream and a lot of inert gas. I do believed that it was Margaret Thatcher in her pre-PM job as an industrial chemist who perfected that particular ploy to boost profits for ice cream makers.
That's why real ice cream, if I may use that term, is denser. It's just cream, sugar and a few flavours and/or fruit bits.
Bulla, Cadbury, non name, etc is pumped full of nitrogen to bulk it up. It also makes it easier to scoop and is less solid to eat.
Ice cream, being a solid, should be sold by weight. Like ice cream's dear and close cousins, butter, cheese, cottage cheese, etc. That's all sold by weight.
Bottom line is that it's just another marketing scam. Knowledge is power.