This does seem to have parted ways with reality in several respects. Read a megabyte from main memory in three microseconds? That’s much too fast, because they model memory getting faster. But they model CPU as stagnant, meaning the time to compress a 2kb block with zippy (snappy outside google) is much too slow. CPUs are not stagnant.
ETA: 20 GB/s SSD reads is a bit fanciful, as is > 1 GB/s sequential from a disk.