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

"My opponent used this card's <When Digivolving> effect to prevent my Digimon with 6000 DP or less from attacking or blocking. If that Digimon's DP increased to 7000 or more by an effect afterwards, can it attack or block?"
No, it can't. A Digimon targeted by this effect will be affected until the timing specified in the effect, even if its DP increases to 7000 or more after the effect activates.
Ruled Mar 28, 2024
If I use this card's <When Digivolving> effect on an opponent's Digimon with 8000 DP and its DP is reduced by -2000 so that it becomes 6000 in a situation where I have a blue or yellow Tamer in play or I have a card with the [Armor Form] in my trash, can I choose that Digimon as the target for the effect that prevents 1 Digimon from attacking or blocking?
Yes, you can.
Ruled Mar 28, 2024
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