Thanks for the reference, and also for pointing out the times. That saves me time!
It is hard to verify some of these claims. Some accounts are only in the commentaries and I normally do not trust them.
However, we can trust such detailed accounts are in the Vinaya Piṭaka.
– But those accounts in the Vinaya Piṭaka are only relevant to events during the time of the Buddha.
– What happened at the time of Ven. Mahinda is obviously not going to be in the Tipitaka, but in the commentaries. The original commentaries (except for 3 included in the Tipitaka) have disappeared and the existing commentaries are not reliable.