The 'gravity' method works in exactly the same way as any other method. The only difference is in the pressure difference between the level in the master cylinder and the bleed nipple. The 'head' of fluid provides the lowest difference possible, so is the slowest method possible. Other than that, it's identical to 'pressure' bleeding and 'vacuum' bleeding. They're simply different ways to create a differential pressure which moves the fluid. You could get an even slower flow by driving the car up a mountain to bleed the brakes. Alternatively, it would be slightly faster if you went into Death Valley to do it.
As noted in the cited thread, the relevance of a T4 is not explored,. On the other hand, gravity is great for a paraphernalia-free, single-handed brake bleeding experience. You can read your favourite book at the same time.
TC
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