According to Śrī Jīva Gosvāmī, nidhanam means the transcendental abode of the Lord. Ni means the highest, and dhanam means opulence. And because the abode of the Lord is the highest manifestation of transcendental opulence, His abode can therefore be called nidhanam. Apart from the grammatical elucidation, the real purpose of the word nidhanam is to indicate that all the members of the Vṛṣṇi and Bhoja dynasties were direct associates of the Lord, and after the end of His pastimes, all the associates were dispatched to their respective positions in the transcendental abode.
Śrīla Viśvanātha Cakravartī Ṭhākura elucidates the meaning of ākṛtim as pastimes. A means complete, and kṛtim means transcendental pastimes. Since the Lord is identical with His transcendental body, there is no question of His changing or quitting His body. To act in accordance with the rules and customs of the material world, the Lord seems to take His birth or leave His body, but the pure devotees of the Lord know well the actual fact. It is necessary, therefore, for the serious students of Śrīmad-Bhāgavatam to follow the notes and comments of the great ācāryas like Jīva Gosvāmī and Viśvanātha Cakravartī. To others, who are not devotees of the Lord, the comments and explanations of such ācāryas may appear to he grammatical jugglery, but to the students who are in the line of disciplic succession, the explanations of the great ācāryas are quite fit.
The word upagateṣu is also significant. All the members of Vṛṣṇi and Bhoja directly reached the abode of the Lord. Other devotees do not reach the abode of the Lord directly, but the pure associates of the Lord have no attraction for the opulence of any planets of the material world. Sometimes, due to inquisitiveness, devotees who are to be promoted to the abode of the Lord have some attraction for the opulence of the higher material planets above the earth, and thus they desire to see them while going up to the perfection. But the Vṛṣṇis and Bhojas were directly dispatched because they had no attraction for material planets. Śrīla Viśvanātha Cakravartī Ṭhākura also suggests that according to the Amara-kośa dictionary, ākṛti also means "signal." Lord Kṛṣṇa ordered Uddhava by signal to go to Badarikāśrama after His departure, and Uddhava, as a pure devotee of the Lord, carried out the order more faithfully than going back to Godhead, or the abode of the Lord. That was the cause of his remaining alone even after the departure of the Lord from the face of the earth.