If you scroll toward the bottom of the page you'll see a topic "Subjective and Objective Justification and Justification and Evangelicalism", there are PDF documents attached which explain the LCMS position on justification.
If you open the Leader's Guide for Session 2, and go to page 3, you'll find the following information:
5. Summary of Objective Justification
Let’s review once again the definition of objective justification with which we started:
“By ‘objective’ or ‘universal’ justification one means that God has declared the whole world to be righteous for Christ’s sake and that righteousness has thus been procured for all people. It is objective because this was God’s unilateral act prior to and in no way dependent upon man’s response to it, and universal because all human beings are embraced by this verdict. God has acquired the forgiveness of sins for all people by declaring that the world for Christ’s sake has been forgiven. The acquiring of forgiveness is the pronouncement of forgiveness.”
Interestingly, the Leader's Guide assumes that lay people will react negatively toward UOJ. So the guide presents 'talking points' to address the questions that come up. At the bottom of page 4 you'll find the following information:
9. Objections to Objective Justification
Depending on how the discussion has gone to this point, the instructor may want to select or focus on specific objections that are most relevant to the particular context of his hearers.
"Does this mean that all people will go to heaven?"
To answer that, let’s start with the basis of all talk about justification: Christ’s work. Christ bore the sins of all men on the cross. He paid for the sins of all men.
"If He paid for the sins of all people, how can it be that there are still people who will have to pay for their sins in hell?"
We believe in the perfect, all-atoning sacrifice of Christ and that those who reject Christ enjoy no benefit of this sacrifice. We do not say that Christ’s sacrifice did not pay for all their sins. We say that because of the sacrifice of Christ, all are forgiven. Those who reject this sacrifice of Christ as it is proclaimed to them as the forgiveness of all their sins will get what they want. They do not want to be forgiven, and so God will regard their sin as they want it to be regarded — as not covered by Christ’s sacrifice. He who rejects God’s absolution will be treated as one who has rejected God’s absolution and will be judged according to the Law.
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GJ - Modern Missouri is doubly damned because they want to suggest their Subject Justification is Justification by Faith, so people mistakenly believe Objective Justification is the Atonement. But both parts are utterly wrong.