وَمَنْ صَلَّى الظُّهْرَ فِي رَحْلِهِ وَحْدَهُ صَلَّى كُلَّ وَاحِدَةٍ مِنْهُمَا فِي وَقْتِهَا عِنْدَ أَبِي حَنِيفَةَ رَحِمَهُ اللَّهُ تَعَالَى.
Translation: Whoever prays Dhuhr alone at his lodging performs each of the two prayers in its own time according to Abu Hanifah.
The phrase fī raḥlihi waḥdahu describes a person praying separately at his lodging. For Abu Hanifah, joining the specified imam-led congregation is a condition of this advance combination.
In the stated case the lone worshipper performs Dhuhr at its time and Asr at its time. The earlier congregational procedure is not automatically extended to this case.