5 official rulings from Bandai, last ruled Sep 20, 2024. Straight answers to how this card actually resolves.

If this card is in my hand, deck, or trash and another copy is revealed in a security check, is this Digimon treated as a yellow card?
No. When a card is in any area other than your battle area, <Your Turn> effects do not apply. So this card is not treated as a yellow card and is treated only as a red card.
Ruled Mar 28, 2024
When this card is in the breeding area, can I digivolve a Digimon on top of it that requires a yellow Digimon?
No. <Your Turn> effects do not apply in the breeding area, so this card is not treated as a yellow card and is treated only as a red card.
Ruled Mar 28, 2024
Which cards can be played by this card's [Main] effect?
The card is either a "Red tamer card with a play cost of 4 or less" or a "Yellow tamer card with a play cost of 4 or less".
Ruled Sep 20, 2024
Does this Digimon treat this card as a yellow card when it is in hand, deck, trash, or when it is turned over by a check from security?
No. When it is outside of the Battle Area, it does not activate the effect of [Your Turn], so it does not activate the effect of treating it as a yellow card, but only as a red card.
When this card is in the Breeding Area, can it evolve from a Yellow Digimon to a Digimon that can digivolve?
No, the [Your Turn] effect is not activated in the Breeding Area, so it is not treated as a Yellow card and cannot be evolved from a Yellow Digimon to a Digivolution-ready Digimon.
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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.