No. You perform <De-Digivolve 1> twice, not <De-Digivolve 2>. When performing <De-Digivolve 2>, the top 2 cards are considered to be trashed at the same time, but when performing <De-Digivolve 1> twice, the top 2 cards are trashed 1 at a time. For example, if using <De-Digivolve 2> to simultaneously trash the top 2 cards of a suspended Digimon and the 2nd card trashed is BT15-047 [Kabuterimon], its effect won't activate. However, if performing <De-Digivolve 1> twice and the Digimon becomes BT15-047 [Kabuterimon] after the 1st instance of <De-Digivolve 1> trashes a card, it won't be affected by the 2nd instance of <De-Digivolve 1> and won't be trashed.
Source: BT21-061 MetalGreymon
