The memory controller for ram on the 10980xe is on the cpu. So they are saying you will be limited by luck of how strong your controller is, as this varies from cpu to cpu. Silicon lottery.
The more ram you have the more strain on the memory controller. So if you populate all 8 slots running fast memory is likely not a option.
I cant comment on the msi board specifically, however I was limited to 3200mhz 128gb Ram for 100% stability when populating all 8 slots, on a high binned cpu. The 8PACK ram worked flawlessly, you may be ok with the 3600 ram if running 4 sticks, or maybe faster if 2 sticks. However depending on how much tweaking, or stability or ram you need, it all can make a difference.
Something from here is likely to work nicely.
https://www.overclockers.co.uk/pc-components/memory/ddr4?ckSuppliers=432&ckTab=0&sSort=2
The platform is hot and power hungry, so ensure you have good cooling/airflow. & unless you have not purchased the motherboard and cpu yet, I'd recommend a thread ripper or even a 5950x as both are faster. The X299 is end of life, and support is limited. However if you have them, that's fine, the platform did me proud for a few years.
I'd just be wary about throwing too much money at it now for the small % of improvement.