It might be their use of LPDDR3 memory. I haven't seen anyone with a 16GB LPDDR3 memory stick.

Edit: Looking at the specs it looks like whiskey lake did not add support for LPDDR4. [1] [2]

[1] https://ark.intel.com/products/149091/Intel-Core-i7-8565U-Pr...

[2] https://www.anandtech.com/show/13275/intel-launches-whiskey-...