So I took a look at your short statement. I see two issues (so far):
The statement does not presuppose that God has appoint some to wrath. In fact, the Bible is quite clear elsewhere that all are under sin and thus wrath at some point in their lives (Eph 2:3; Rom. 1:18-32, etc.). In fact, the only thing that can be stated here is that we are not appointed to wrath because we are in Christ.
Second, not every appointment implies a pretemporal election for individuals. TITHEMI can be used for a temporal appointment. For example, the apostles were appointed by Jesus to go a bear fruit (John 15:16). This was not a pretemporal appoint, but one that took place at the choosing of the disciples. Likewise, Paul was chosen for service to Christ because he proved faithful (1 Tim. 1:12). Appointments are often covenantal as well.
We cannot conclude that all appointments are pretemporal elections. Often they are God's activities within time.