A soul can begin at a known point in time, and extend "forever after", just as a ray can in space.
God can be forever in both directions, just as a line.
So I didn't understand why a soul lasting forever would need to imply that it had existed from all eternity.
In fact, I would contend that such a claim is in direct contradiction to Scripture.
Which states that God created all things, excluding himself, that is, but including all living things, both spirit and flesh.
If souls were pre-existing from eternity, in what sense are they "children of God?" They would be his co-equals in longevity, although not in power.
The Declaration of Independence says men endowed by "their Creator" with inalienable rights. The term "Creation" by definition means a new existence, not a recycling.