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Why is Light Noon excluded after an Alif in this paradigm (ملحکہ الف باشد درنیاید) according to the source?

Conjugating Present Emphatic with Light Noon (Active & Passive)

• Due to the meeting of two silent letters in an unacceptable manner (بسببِ لزومِ اجتماعِ ساکنین علی غیرِ حدِّہ)
• Because it is only for verbs without Alif
• Because females cannot pronounce it
• Due to a grammatical error