These instructions are more than sufficient if you have rudimentary understanding of how itemization works in 4.0 . This understanding can be achieved by hovering the mouse over items and reading the stats.
The "to Maximize Average DPS, DtPS or HPS in PVE" tells us that assumption is the piece that maximizes those, the piece that spends the least amount of stat budget to endurance. Token earpieces and implants and, and for 220 rating for dps/heals Lethal mod 43 (non-lettered one), and the enhancements with 99 endurance, not the ones with 131 endurance and less power. Of course unless otherwise mentioned, i.e. more endurance heavy option for tanks with B-mods
When it comes to the tertiary stats Enhancement = Implant = Earpiece. There are multiple gear setups to achieve these stats. All 220 rated enhancements and earpieces, except the tanks' most endurance heavy options which have only 151 of tertiary stats, have 160 of tertiary stats. So those ideal Annihilation/Watchman stats could be achieved by getting 4x160 alacrity, 4x160 critical, 2x160 accuracy from any combination of 220 rated, 99 endurance enhancements and token earpieces and implants.