There is an ongoing discussion about whether a balance bike helps kids learn to ride a bike sooner and if it can help replace the need for training wheels.
I think there is going to be a large amount of variation based on what your kid needs. Each kid is different.
That said, I have seen positive experiences on a balance bike translate into confidence on the bicycle. Especially if the kid has learned how to pedal on a tricycle.
Many of these kids feel trapped by the training wheels and are anxious to get them off, so they are motivated to get back to the freedom they had with the balance bike.
And, sometimes they might push the bike around without training wheels just like they did with the balance bike. At least until they get their balance and confidence with the bike.