First part:
Yes. I mixed up the two suttas. Corrected it. Thank you!
Second part:
Yes. Both explanations hold.
– Attachment to them sustain the rebirth process. Losing attachment to them (with the correct seeing of the true nature) leads to stopping their arising, i.e., Nibbana.
Third part:
Yes. The Buddha described “loka” in several ways: six dhatu, five aggregates, 12 ayatana, etc.
No errors. Very good. This is real insight mediation!