"Upgrade Memory of 2018 Macbook Pro"

According to this you can:

https://support.apple.com/kb/SP776?viewlocale=en_US&locale=en_US

"Memory

• 16GB of 2400MHz DDR4 onboard memory

Configurable to 32GB of memory"

So is it possible or not? (They use the term "Configurable" to 32GB of memory. Perhaps that's like "over-clocking?" -- Some type of software override trick?)

Or does it simply mean: You can order it in either 'Configuration' -- meaning buy it pre-installed with either 16 or 32 GB of RAM ONLY when you order/buy it?