I partially agree with him. 2R0 x25-V is not twice as fast as an x25-M, on any meteric.
x25-M: seq R/W 250/80 MB/s, 4KB random IOPS @QD 32: 35-40K/10-15K (140-160MB/s / 40-60MB/s)
2R0 x25-V: seq R/W 360-380/80 MB/s, 4KB random IOPS @QD 32: 60K/20K (240MB/s / 80MB/s)

From a lot of benchmarks, i've seen that 3 x25-V performs simelarly to 2 x25-M 80GB. Meaning 2R0 x25-V should be roughly 2/3 faster than a single x25-M. Sequential write heavy tasks will be an exception.