Is raising the voices of the congregants with "Ameen" after the Imam finishes reciting the end of Surat Al-Baqarah in the Friday prayer considered an innovation (bid'ah)?

The congregants' loud "amin" after the imam's recitation of the end of Surat Al-Baqarah is an innovation (bid'ah) that was not practiced by the early Muslims (Salaf). It is rejected based on the Prophet's (peace be upon him) saying: "Whoever introduces into this matter of ours anything that does not belong to it will have it rejected." The only prescribed "amin" is after the imam recites Surat Al-Fatihah, based on the Prophet's (peace be upon him) saying: "When the Imam says 'amin,' then say 'amin,' for whoever's 'amin' coincides with the 'amin' of the angels will have his past sins forgiven." What was reported from Mu'adh (may Allah be pleased with him) regarding his saying "amin" after Surat Al-Baqarah has a weak chain of narration, and it refers to the reciter saying "amin" for himself, not the congregants saying "amin." Furthermore, gathering in circles on Friday before the prayer is prohibited.