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

What does an "add X000 to the maximum your DP-based deletion effects can delete" effect do?
Such effects increase the maximum value shown for DP-based deletion effects. For example, while "<Your Turn> Add 1000 to the maximum your DP-based deletion effects can delete" is activated, "<When Digivolving> Delete 1 of your opponent's Digimon with 3000 DP or less" will allow you to delete an opponent's Digimon with 4000 DP or less.
Ruled Sep 13, 2024
If "add X000 to the maximum your DP-based deletion effects can delete" is activating, can the maximum be increased for an effect such as "delete 1 of your opponent's Digimon with DP less than or equal to this Digimon's DP" that references a Digimon's DP for deletion?
No, it can't be increased. You can't increase the maximum of a DP-based deletion effect that doesn't show a numerical value.
Ruled Sep 13, 2024
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