Tashīl eases a hamzah; ibdāl replaces it according to the stated rule. In the open-waṣl interrogative case, the replacement produces a lengthened alif realization.
Thus ءَآلذَّكَرَيْنِ should not simply be read as two ordinary short fatḥahs. The difference is auditory, so compare a correct recitation of the forms.
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Do not conflate tashīl and ibdāl
Rules of Hamzah — Taḥqīq, Tashīl, Ibdāl and Hamzat al-Waṣl
Tashīl eases a hamzah; ibdāl replaces it according to the stated rule. In the open-waṣl interrogative case, the replacement produces a lengthened alif realization.
Thus ءَآلذَّكَرَيْنِ should not simply be read as two ordinary short fatḥahs. The difference is auditory, so compare a correct recitation of the forms.