Lactose free milk

Are all lactose free milks the same?

Most lactose free milks have the sugar content at 4.5 to 5 g, essentially the same as normal milk, due to the lactose sugar conversion to glucose.
However the Arla lactose free milk is stated as 2.6 g of carbs per 100 ml, all sugars. This is about half that of normal milk, so although lactase is being added, between the lack of sugars and what their website says, it sounds like they might be filtering out some of the lactose then adding lactase to get the rest?

Milk, but not as you know it. Arla Lactofree has all the nutritional benefits and taste of standard milk, just without the lactose. It is made from all natural ingredients - we simply filter milk and break down 100% of the lactose so everyone can enjoy some simple, nutritous goodness. Our UHT version is specially made to last longer so you can stock up and never run out! Available in semi skimmed and whole.

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Any knowledge here before I contact Arla?

Please note I am aware that various non-cows milk alternatives exist, I've experimented plenty.

Well I got an answer, they remove 40% of the lactose and rest becomes glucose:

In lactose free products, we have split the lactose into glucose and galactose for you. At most dairies we use technologies to first pass the milk through filters that remove 40% of the lactose. Next, we remove the remaining lactose by adding the enzyme lactase that can separate the two molecules.

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