01-06-2020 03:51 AM - edited 01-06-2020 03:51 AM
Officially, it supports 8GB, however a friend of mine had L430 with 2x 8GB RAM installed. Device worked fine for years, so it is compatible.
01-06-2020 05:29 AM
The specs say 8GB because at the time this generation hit the market there were no 8GB RAM modules.
As already confirmed above, 16GB should work with no issues. I don't have a L430 but I have few T430, T430s, T530 and L530 with 16GB RAM working with no issues whatsoever.