وَيُكْرَهُ أَنْ يُصَلِّيَ الْمَعْذُورُ الظُّهْرَ بِجَمَاعَةٍ يَوْمَ الْجُمُعَةِ، وَكَذَلِكَ أَهْلُ السِّجْنِ.
Translation: It is disliked for persons excused from Jumuah to perform Zuhr as a separate congregation on Friday; the same applies to prisoners.
This discourages a competing public congregation on Friday. The ruling targets organizing a separate Zuhr congregation, not the excused person’s underlying right to pray Zuhr.