FUD or did you not do your homework?
Yes it does add up (if your data can get you a 5 to 1 reduction)
Each chassis (3 units) hold 20 flash modules or 20 direct flash modules. Each capacity pack is 10 modules but the chassis can hold 2 capacity packs = 20 modules.
Look at their specs:
PS: I am pretty sure of the above as I have 3 FlashArray//M systems :)