If I use this card’s effect to place an opponent’s Digimon at the top of their security stack, is that Digimon then trashed?
Yes, that's correct. If you choose to place an opponent’s Digimon at the top of their security stack, you are in effect choosing to trash the chosen Digimon.
Mar. 28, 2024
What happens if I use this card while my opponent has [BT9-103 Kongou]'s effect activated?
Due to [BT9-103 Kongou]'s effect, cards can't be placed in security stacks, therefore this card's "place 1 of your opponent's Digimon face down at the top or bottom of your opponent's security stack" can't be activated, and the target Digimon will be left as-is.
Mar. 28, 2024
If I use this card’s effect to place an opponent’s Digimon at the top of their security stack, does that Digimon’s [On Deletion] effect activate? Additionally, do effects on other Digimon and Tamers that care about Digimon being deleted also activate?
No. The Digimon isn’t being deleted, so none of the above occurs.
Mar. 28, 2024