2 official rulings from Bandai, last ruled Sep 13, 2024. Straight answers to how this card actually resolves.

Does "then, delete 1 of your opponent’s lowest level Digimon" in this card's <On Play><When Digivolving> effect activate even if my opponent doesn't have as many or more total Digimon and Tamers as me?
Yes, it activates.
Ruled Mar 28, 2024
I play this card when my opponent only has 1 EX1-073 [Machinedramon] in the battle area. At this time, I use "delete 1 of your opponent's highest level Digimon" in this card's <On Play> <When Digivolving> effect, and the 2nd <All Turns> effect on my opponent's EX1-073 [Machinedramon] interrupts it and prevents the deletion. If I then use this card's "delete 1 of your opponent's lowest level Digimon" effect, can the 2nd <All Turns> effect on my opponent's EX1-073 [Machinedramon] again interrupt the effect?
Yes, it can. The 2nd <All Turns> effect on EX1-073 [Machinedramon] can interrupt both deletions performed by this card's <On Play> <When Digivolving> effect.
Ruled Sep 13, 2024
Got a line that uses Leviamon? Map it in the builder and share it with a link.
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.