Making allowances for the fact that both Huxley and Orwell were here implicitly taking an ultimately political, hence evil, point of view; and thus they stop their analysis at 'power' when they ought to recognise that power is just a means to spiritual ends...
Then this passage highlights that we need to be aware that with evil beings it is 'lust', or motivation, that is being gratified.
Huxley was correct that we need to appreciate that demonic beings enjoy the corrupting of Men into 'loving their servitude' - i.e. desiring their own damnation - as much or more-than inflicting short-term misery. They enjoy long-term manipulation leading to value-inversion (evil seens as Good, Good as evil) - as much as or more-than inflicting acute physical torment and death.
That is indeed the primary motivation behind the Ahrimanic evil that is dominant in the world here and now.
It is an error to suppose that the global Establishment are motivated by a desire to torment and kill the masses - Their primary motivation is to make the masses love their servitude, embrace a wholly materialistic and this-worldly understanding; and thus to desire damnation.
In different words; the agents of Ahrimanic evil enjoy being regarded as Good; and hate more than anything being exposed as evil.
Ahrimanic evil intends that it should be unknown, unseen, denied, hidden; and its agents therefore conceal their own activity behind what is presented as objective, materialistic, abstract Good.
Thus whenever we perceive something evil-seeming presented as wholly-impersonal, just a 'process',/ procedure; mere 'randomness', luck, statistical 'probability', unintended consequences, accident or error...
Whenever causes are put-down to mechanical operations of alogorthm, computer, committee/ bureaucracy... a mere outcome of The System; then we should suspect the presence of Ahriman.
(In effect: Ahriman lives in the imuted impersonal: that is where he hides himself.)
Ahriman, or Satan - as Christians more often call him - never wants to be known for what he is.
He and his servants fear above all being detected; being detected and known as real; being known as beings who are evil in motivation.
That is the weapon with which Ahriman's goals may be fought - whether in our own souls, or more widely.
Seek Ye Satan in the impersonal, in the 'merely' automatic; in the un-conscious, the ignored and the denied...