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

I use this card's effect to place a Digimon on top of my security stack. Does that Digimon's <On Deletion> effect(s) activate?
It wasn't deleted, so <On Deletion> effects don't activate.
Ruled Mar 28, 2024
Can I use this card's effect to place my [EX2-007]/[Mother D-Reaper] on top of my security stack from the battle area?
No, you can't. If your [EX2-007]/[Mother D-Reaper] is chosen as the target to place in the security stack, according to the rules it will be placed at the bottom of the Digi-Egg deck instead of the security stack. A card isn't actually added to the security stack, therefore effects such as "when a card is added to the security stack" don't trigger.
Ruled Mar 28, 2024
Can I use this card's effect to place my token that was played as a Digimon on top of my security stack from the battle area?
No, you can't. If your token is chosen as the target to place in the security stack, according to the rules it's removed from the game instead of being placed in the security stack. A card isn't actually added to the security stack, therefore effects such as "when a card is added to the security stack" don't trigger.
Ruled Mar 28, 2024
If I choose my [EX2-007]/[Mother D-Reaper] or token that is treated as a Digimon in the battle area as the target for this card's effect, it isn't placed in the security stack. In such cases, do "when a card is removed from the security stack" effects trigger because a card wasn't added to the security stack even though it normally should have been added?
No, they don’t trigger.
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.