No, I don’t believe the Maharal ever made a golem. My reason is that nobody ever heard of this story until the early 19th century. There are many stories of the Maharal, that have been told ever since he was alive; but there is no story about his making a golem.
The biggest proof is that Reb Tia Weil, who lived in Prague in the late 18th century and was a talmid of the Noda Biyhuda, a successor to the Maharal’s rabbonus, wrote a whole book about golems, containing ever fact he could gather about them, and yet he doesn’t mention that the Maharal made one. If the story were true, how could he not have heard of it? The only possible answer is that it hadn’t yet been invented.
So no. Reb Eliyohu Chelmer made a golem, probably some other people made them too, but the Maharal didn’t.