It's very stable and steady, but a strong enough wind will knock anything over.
Accept that no matter how heavy the tripod, there is a gust of wind strong enough to blow your camera over. Knowing that, you can take appropriate steps in windy conditions to prevent that happening, like tying it off to a camera bag, staking it to the ground, sand-bagging, leaving it set low except when you have a hand on it, or never leaving the tripod when set up in significant wind.
I don't necessarily agree with the idea that a really strong wind can blow any tripod over. All you need to do is to set it on the 2nd or 3rd leg angle position, and I don't think any wind is going to be able to blow it over. I think the wind thing is only an issue when it is set at the steepest leg angle position, which should not be commonly used for most types of wildlife photography, anyway.
Most wildlife is photographed most effectively from a kneeling or prone position, with the camera fairly low to the ground. When doing this, it is best to have the legs extended all the way out, but to have them at a very shallow angle, which effectively doubles the overall footprint. When you set it up like this, which you should for 90% of all wildlife shooting, then it is impossible for wind to knock it over. It seems to me like the OP understands the value of shooting from a very low POV, as he wants a tripod that willl go down to almost ground level.
It's really only when you are standing up and shooting at that kind of crazy height that you need to worry about wind. But how often is a wildlife photographer going to shoot from a standing up position? Hardly ever, if he cares about pleasing backgrounds and appealing composition. Exceptions do exist, of course, as there are occasions that call for setting up lower and shooting from a lying down flat on the ground position, and there are also times when conditions call for one to shoot from a standing up position......although the latter are rare.
EDIT: here's a pic to show one of the angle at which tripods are set up at for about 90% of all effective wildlife photography. They have theirs set to the 2nd leg angle position - setting it at the 3rd leg angle position would create an even larger footprint, and be even more stable against the wind.