Very true. The slack reserve space, RAM buffer (and/or battery), and NAND process are the main things that make an enterprise drive.
The author doesn't specify a metric for writes, but based on the MX300 specs that I find, it can go up to 219 GB/day for the 2TB drives he uses, or 87 GB/day for a couple of the 525GB he still had. He doesn't specify though.
