It's a conservative figure LR use to cover themselves if someone drowns themselves or their vehicle. I and many others have driven through significantly deeper water...think we went through 1.2m getting to camp in Litchfield NP.
If you have a snorkel, don't simply rely on it - check the air box is really water proof. Use a tarp over the engine bay too, turn off AC, walk the crossing too if at all possible.
But even a stock Defy will drive through water deeper than a half metre any day of the week.
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