Voldemort had two definite ways to study time magic:
First, [Lin Zuo Moment], his Golden Finger.
Once he activated this ability, his magic naturally gained temporal properties.
But he wouldn't use it to create a Möbius strip with temporal properties, because the temporal properties granted by his Golden Finger would diminish.
Aside from that, Voldemort didn't like using something whose origins he didn't understand in anything important.
He preferred to analyze [Lin Zuo Moment] first, then incorporate the ability directly into his magic.
He had wanted to analyze his Golden Finger long ago, but unfortunately, he'd never had the time.
The second way was through a Time-Turner.
Faced with these two options, Voldemort chose the latter without hesitation.
The reason was simple: if he wanted to obtain time-related magic by studying [Lin Zuo Moment], he would first have to dissect the origins of his Golden Finger, which would itself take a long time.
The Time-Turner, on the other hand, was already a highly developed piece of magic.
The Ministry of Magic even had a wealth of related materials.
Voldemort was eager to resolve the conflict between his two sets of memories, and naturally didn't want to waste time.
Rather than researching it himself, he could simply draw on existing, fully developed magical knowledge.
Voldemort had no qualms about borrowing from others, nor any desire to make things difficult for himself, so he made his choice decisively.
He immediately got up, left the back garden, and headed for the Malfoy family's castle.
Everyone was gathered there, holding an elaborate welcome celebration for Percy.
Nearly all the Death Eaters who knew Voldemort had returned to life had taken part in the celebration.
Lucius had three reasons for doing this:
First, Percy was one of Voldemort's disciples, and Voldemort thought highly of him.