The claim that objective morals are built into the universe completely depends on an unproven assumption about the exact type of love God possesses. And that the creator can be understood in somewhat personal or relationship terms.
There are two massive flaws in that theological argument:
The Definition Problem: "Love" can mean many things. A creator could love the universe like an artist loves a tragic painting—valuing the grand drama or raw power over human well-being. Only a very specific, benevolent love implies objective moral rules.
The Arbitrariness Problem: If morality depends on God choosing one specific vibe or type of love to build the world with, then morality is ultimately arbitrary. If God had preferred a love of chaos, then chaos would be our "objective" good.
Assuming a benevolent creator to prove benevolent morals is circular
reasoning. It is a logical leap, not a definite fact.