لَهُ مَعْنَى الرُّبُوبِيَّةِ وَلَا مَرْبُوبَ
Allah possessed the meaning of Lordship even when there was no subject under His nurturing and governance.
Rubūbiyyah (Lordship) is a divine perfection, while a marbūb is a created being that needs His care and governance.
The coming into existence of such creatures does not change the eternity of His Lordship.