Points we see in the document:

p 19. .. "We have also instructed our personnel not to participate in interrogations by military personnel which might include techniques authorized by Executive Order but beyond the bounds of standard FBI practice. ... the things our personnel witnessed (but did not participate in) were authorized by the President under his Executive Order. ...

The email goes on, on this page, to discuss what is considered abuse, because an FBI employee must report incidents of abuse. Why is this an issue? Because there's a caveat in what techniques can be used that might be authorized by someone high up the food chain.In other words, even though the use of what might be abusive techniques was no longer okayed, because a directive from higher up still might use them, the FBI wasn't going to call them abuse.

This instruction begs the question of what constitutes "abuse". We assume that does not mean lawful interrogation techniques authorized by Executive Order. We are aware that prior to a revision in policy last week, an Executive Order signed by President Bush authorized the following interrogation techniques among others sleep "management" use of MWDs (military working dogs) "stress positions" such as half squats, "environmental manipulation" such as the use of loud music, sensory deprivation through the use of hoods, etc. We assume the OGC instruction does not include the reporting of these authorized interrogation techniques