If you use the reporting interface they seem to update promptly. There’s a major road near us where Google used to tell people to make a illegal left turn across 4 lanes of traffic, which was common enough that I used to see it almost every time I went by for years. Once I found the well-hidden reporting UI, that stopped two weeks later.

There is a no-left-turn street near my work, and Google maps keeps telling me to turn left there. I've been reporting it every now and then since at least 2018 and it does nothing.

Yeah, don't ask me to defend Google on any customer service topic. I automatically believe any lapse you report.