Yes. If he lost control of founding power, then the titans should have gone mindless but they didn't, they stood still in a formation.

Why does he need to touch the baby at all? I thought royal blood is irrelevant now since Yimr supposedly isn't a slave to the royal family

Many people theorize that Eren is in Paradise or he is in two places at the same time, but what if he uses the paths to contact with the baby, we dont know if the " contact " needs to be in the fisical world.

Imagine Eren and Historia holding her baby in the paths, Eren touches the baby and the rumbling starts again.

I think is far more simple than the "cable theory" or the two body part.

Eren can activate the rumbling in the paths