The point is that they were able to meet capacity with 4g towers. I'm not sure how that's related. I guess I should also point out that the population of the city is 600k people, so it may not carry over to something like NYC or Tokyo.
And most of those towers provide comparably low-bandwidth connectivity (at least outside urban areas). It's not like you have decent speeds up here, but the legally mandated 2mbps is available in most places.