The link you provide doesn’t explicitly state it’s a concentrate but it does mention mixing with water.
But if you click on the flyer within the right of that web page, that also doesn’t specifically state it’s a concentrate. However, the flyer does talk of mixing with distilled water and includes a section on mixing rations and the frost protection it provides. Oddly it states to avoid storage above 32C (WTF?, it’s a long life coolant
)…
Interestingly, ACDelco DexCool 10-101 Extended Life Coolant, as sold on Amazon US, does specify it’s an orange concentrate.
Buy ACDelco 10-101 DEX-COOL Extended Life Coolant - 1 Gallon: Antifreezes & Coolants - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
In any case, the Aussie stuff in your link is @ 1040g/L of ethyl glycol which is very much a concentrate.
If you have any doubt, why not ring a Holden dealer who sells ACDelco DexCool and specifically ask them? they’d be able to clarify such along with their price