Hughes (the well of souls guy) was fated to die that day. However, if you understood the whole fateless one concept, you would understand that you do change others fate.
Hughes, who was to die that day, distracting the Tuatha soldiers, so that you could make it out, doesn’t in fact die. Thus, you did in fact change his fate as well. And if you listened to what the NPC’s were saying he isn’t the only one. You change many other NPC’s fate. He was but the first . The second that comes to mind is the first fateweaver, Agarth in Didenhil. He knew when he was fated to die. And when the fated incedent occured and he didn’t die, he states how you again changed fate. There were countless other instances where you changed the fate of others all throughout the game.
One has to pay attention to what is said in games such as this, to understand the games concepts. It is better to pay attention, then to state that the concepts are flawed. The concept here is clearly not flawed. The fateless one does in fact effect others fate. Once you play through the actual game, rather then just the demo, this all becomes quite clear.

The whole story is that you are savin this empire thats fate is to fall through some evil moterfucker

Not really, the point of being “Fateless” was that you can make your own destiny, you can “weave the threads of fate”. This means that you can in-fact influence the fate of others, and determin your own. If the protagonist wasn’t able to affect the fate’s of others then his actions would be of no consequence, and the game would suck.