So where is your logic? Keep in mind that logical arguments don't usually end in question marks.
Perhaps you could read the thread, but it started with the discussion of infinite regress.
My contention is that it is impossible for time to extend infinitely into the past.
If we take yesterday as an example. If time extends infinitely into the past that means that infinite time passed before yesterday occurred.
But this is impossible because infinite time never passes. That is the definition of infinite time. As you said unbounded. Never ending.
Therefore it is impossible for time to extend infinitely into the past because yesterday did occur.