Naturally, there can be no "guarantees" or floor prices beyond the scope of what the IPO suckers investors are willing to hand over. And if you don't have full coverage for the 540,000 coins in the first year (as promised), and the hoped-for prices don't materialize, how will you cover the buybacks? The public exchanges surely won't care one bit about an arbitrary floor price.
Not only that, but they "guarantee" the floor will be increased over time.
They claim they will hold future fundraisers to fund the floor increase.
This is pretty much a ponzi type scheme that is not sustainable. If done right then early investors might be able to make some money on future suckers, but I doubt even that would last long.