There are two main issues with this statement:
A: A “progress line” is an incredibly vague term, and a massive oversimplification of what is, in actuality, an incredibly complex process that involves massive amounts of time and effort to execute properly. What you have seemingly just stumbled upon, and have been very quick to make a highly misinformed post about, is called game design; or, more specifically in this case, the aspect of it that is usually termed progression.
B: As Pesky said earlier, the examples you cited to further your case that “unturned progress line is sucks, a bullshit” are cherry-picked and do not, in the slightest, show a representative sample of games and their design in general. Fortnite is one good example; the progression in the game is nearly non-existent, due to the fact that matches of the game hardly ever last more than an hour, but the game is incredibly popular nonetheless. Good games do not require a massive amount of progression to be entertaining; another interesting example would be Counter-Strike: Global Offensive- the game has almost no progression outside of the steady accumulation of cash to purchase new weapons, but is also a very successful game.
What you seem to have an issue with is the lack of a defined end-game goal for Unturned, in addition to a defined series of goals within the game itself. I would contest this assumption; if we are to reduce Unturned and the gameplay that it entails into a series of short blurbs defining the progress of the player, you can easily see a series of goals and a defined end-game objective contained within the game. For example:
Obtain basic necessities such as food, water, and an initial set of clothing.
Obtain more advanced needs such as basic firearms, vehicles, etc.
Loot a military base and procure advanced military firearms and other equipment.
Construct a structure to hold and contain said firearms and equipment.
Procure gasmasks, and attempt to loot the deadzones on the map.
Attempt to obtain raiding materials and damage the structures of other players.
This is by no means an anemic set of these goals and end-game objectives.
As of such, I find your statement to be one that is full of holes to the point where it cannot even be said that the statement was ever an intact statement in the first place; it simply contains so many fallacies and logical errors that it cannot be assumed to hold even the slightest essence of fact.
