Broadwell-U real RAM limit.

I am using the Dell Latitude E7250 with Intel Core i5-5300U, 6GB of DDR3L, Intel HD Graphics 5500. I am planning to upgrade the RAM to 16GB when I see this news: https://www.pcworld.com/article/2894509/want-32gb-of-ram-in-your-laptop-or-nuc-you-can-finally-do-it.html. There is also a guy in the Dell Community claimed that he can install 32GB of RAM in the Dell Latitude E7450, his forum is here: https://www.dell.com/community/Latitude/Latitude-E7450-Memory-upgrade-max-RAM/td-p/7292724. Is 32GB RAM possible in the Broadwell-U Ultrabook from Dell? All the model I want to ask are E7250, E7450, E5250, E5450, E5550, 3350 with Broadwell CPU (except the E5250, E5450 and E5550 with Haswell CPU which are definitely incompatible). Do all of that models I mentioned before? works with 32GB of DDR3L RAM?