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You can put up to 16gb in this machine using both slots it has. It will run default at 2400mhz even if your system comes with 2666mhz. Hoping Dell comes out with a bios update to fix this as it does add some performance, but for 300 bucks.... It's pretty amazing. Hard drive is also expandable both m.2 and hdd so you can make it a very quick machine.
The 16GB is correct as maximum RAM memory. I just wanted to add, however, that the Specifications section notes that there are two slots for memory and both are filled, to add up to 8GB. This means that if you wanted to go to the full maximum of 16GB, you should add the cost of the 16GB to the cost of the laptop, since absolutely none of the memory in it as it comes from the store would be usable.