Yes, he did.

Did the prophet pbuh say ameen loudly. When praying. Please clarify

Prayer | March 13, 2017 1:15 am
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In our office, one of our brother sometimes lead prayer. After he returns back from bowing, he always says ‘Rab-a na-wa-lak-al-humd’ loudly. Some people praying behind him have objected to this and we need your opinion before we request this brother for correction, if he is wrong.
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We follow the shafi/ Umm al qura time for prayers. In Pakistan the time differs by up to 50 minutes for Asr. Can I prayer my salaah when I get the alert for the shafi time but before the local masjid Athan.