If a Digimon has [On Deletion] has an inherited effect, can this Digimon's [When Digivolving] effect target it?
No, that Digimon does not have [On Deletion].
If a Digimon was given [On Deletion] from its digivolution card's inherited effect, can this Digimon's [When Digivolving] effect target it?
Yes, that Digimon was given [On Deletion] while in the battle area.
If a Digimon was given [On Deletion] from an Option card's effect, can this Digimon's [When Digivolving] effect target it?
Yes, that Digimon was given [On Deletion] while in the battle area.