3 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

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.
Ruled 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.
Ruled 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.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.