Thank you, Lal, and I just read the post “Nirōdha Samāpatti, Phala Samāpatti, Jhāna, and Jhāna Samāpatti”, which clarifies some more.
So, is it correct to say the following:
1) Nibbana means either Parinibbana or Nirodha Samapatti.
2) Phala Samāpatti, including Arahant phala samāpatti, are still “this world” because there are citta running.
Lang