I don't think they really have. If you look at the profile it's been stretched out over the front, compromising the approach angle just like the new genuine Defender had to - I don't think there was any way around that.
This isn't on topic, but I think the Grenadier has gambled and lost badly, and they're going to look like fools long-term. The new Defender is massively more rugged and capable than they thought it would be.
They have these smug videos talking about how real Defender drivers want a non-electrically-managed simple vehicle, just in time for the Government to announce that internal combustion is going to be banned, so all vehicles will require electric control for a fuel cell or a battery and motor anyway. So what was the point?
They have smug videos talking about how they've got proper rugged coil suspension. Well I work with actual military rugged vehicles and guess what they have electric air suspension like the new Defender, because it's actually better for the job.
The Grenadier people are pitching in their adverts that the Defender has turned its back on rugged users like the game keepers of the highlands. Well guess what ask a game keeper and they've already bought the new Defender.
I think the universally positive reviews of the new Defender and its off-road capability, including from reviewers looking solely at its use for example on farms and estates, makes the Grenadier look very backward. Turns out the old ways aren't always the best.
(I have a new Defender at home, and still use a fleet of old Defenders at work. I wouldn't want a Grenadier.)