I just remember the goal of SS which was to achieve PHYSICAL immortality as well spiritual and have eternal physical youth
This is a type of the Magnum Opus that can be achieved, yes. Older information overemphasized the MO, though. It got members to stay too daydreamy, instead of focusing on the goals in the moment. Most of us are VERY, VERY, VERY far away from anything close to the MO.
Soul is not immortal and can die if not worked upon.
Still true, yes, but needs more deep explaining, and I'm sure it will be explained in future updates.
You, as in, you as a person, are held together by a bunch of spiritual "organs". Some of those go away on death, some can "rot away" if life beats you down for too many lifetimes or you don't use your soul at all, some are not even "active" by default and need unlocking. Zevism is about building a soul. A soul, once fully built and completed, can never die.
If you, your soul, is scattered and poorly constructed, it will eventually unravel and fall apart.
But instead the site instructs Zevists to learn from Gilgamesh epic that you cannot escape death.
99.99999% of us will meet physical death in this lifetime. We must come to terms with it. Hell, even a lot of Magnum Opus cases are achieved only shortly after physical death, not during life.
Reincarnation does exist, but a meaningful part of the soul does indeed die every time your physical body dies. You don't just leave the body and all is nice, go wait in the lobby room. That kind of idea is, first, wrong, and second, will lead to people thinking death is a laughing matter. It isn't.
And now the ToZ site says the Soul is Immortal. This default immortality of soul doesn’t make any sense to me.
1. Total and complete soul death is highly unlikely for a Zevist, almost non-existent.
2. Certain aspects of the soul are indeed, in a sense, "eternal". Plato spoke of this, Eastern ideas like the Atman spoke of this, and so on, but we do not have a complete picture. What is basically important is that "you", indeed, can permanently die. But "your soul" does include parts that aren't exactly "you".
It's complicated.
It will be updated. For now, just rest assured that these things you stated are still true, they just need more complex explanation. And complex explanation takes time.