Um, no. You are misreading the units of measurement. Lowercase "b" is bit. Uppercase "B" is byte. The unit in the article is byte, and there being 8 bits in one byte. To convert the speed in the article to the units that you are taking about, you would want to multiply by 8. Therefore, Google Fiber averages 20.4 Mb/s in the units that you are referring to. That's a pretty good average for service in the US.
Go back and read the linked article again. The graphic clearly shows the units as Mbps. Bits. The grandparent is correct.