Thanks, Johnny.
Your second reference is good, and I have just revised the post again to include that with another bullet added.
I normally do not give references to English translations of a sutta, but this one good. So, here is the second reference from Johnny: “Pañcakanga Sutta“.
Nibbanic bliss (and the bliss in saññāvedayita nirōdha samāpatti) is not a cetasika vedana, which would belong to this world. I have compared it to the relief one feels when a long-experienced migraine headache finally goes away (in the “Nibbana” subsetion). The above sutta explains too that it is not a cetasika vedana.
However, the first reference does not give a Tipitaka reference. It just makes a statement, which seems to be incorrect based on the Mahāvedalla Sutta (MN 43) as I described in the revised post.