Okasa bhante,
According to the commentary ‘recollection of past lives’ in this particular sutta (khajjaniya sutta) has been considered to be done by vipassana, but with no mention of how to do it by Vipassana.
In the subcommentary, it is explained like below.
vipassanāvasenāti etarahi rūpavedanādayo anussaritvā “Pubbepāhaṃ evaṃvedano ahosi”nti atītānaṃ rūpavedanādīnaṃ paccuppannehi visesābhāvadassanā vipassanā, tassā vipassanāya vasena.
‘vipassanavasena’ means ‘by the vipassana’ which
sees the ‘absence of difference (absence of special-ness)’ of past ‘rupa-vedana-etc’ to present ones
by having recollected present ‘rupa-vedana-etc’ ,
and seeing that “In the past also, I was a person with vedana like this”.
So, according to the classical scholars and the Tika, the mention of ‘recollection of past lives’ in this sutta, is considered an “inference about the past (an understanding)” and not a “real seeing”.
What would be, bhante, your explanation regarding this?