Like suspected it's showing the wrong values:
241 Total_LBAs_Written ------ 100 253 000 - 16039330064
242 Total_LBAs_Read ------ 100 253 000 - 33785959168
Logical sector size is 512 bytes, total LBAs written is the raw number x the logical sector size, so total writes are currently 8.2TB, diskspeed is multiplying by the physical sector size (4096 bytes), so you need to divide by 8 to get correct values.