Interesting, and quite bold. So even if they looked like "Overgrown Sheep Hoof" on the link in the OP I should still leave them alone.
OK, let's look at the 'before' photo in your first link davet:
In the image above you can see a very overgrown sheep hoof with growth curling over the pad or sole of the foot and down from the heel. This condition makes it easy for bacteria, bedding or mud to get caught between the hooves or in the space between the overgrown flap and the healthy hoof, creating an ideal environment for the anaerobic bacteria which cause hoof rot.
Personally, I've been leaving hooves like that well alone. Since sheep walk on the edges of their feet, as long as the foot is still standing straight on the ground, I'm actually quite pleased when I see the hoof curving under like that, as it means there's no pocket developing (an ongoing problem with our sheep). My worry would be that if you trim the foot as suggested (see pic below), the hoof wall might start coming away from the base, causing a 'shelly hoof' pocket that dirt and stones can get trapped in.
Any thoughts folks? have I got this wrong, and would you trim the hoof in the first picture?