The context for 'departure' has an important nuance for the chapter. The chapter starts with focusing on the gathering to Christ, relates that event to the coming Day of The Lord, a judgment period, and the un restraining on the man of sin. The passage refers to the Restrainer preventing the man of sin from being released, shows the Restrainer is first a neutral pronoun then shifts to a masculine pronoun as in The Holy Spirit 'he' as being taken oput of the way. Since it is The Holy Spirit abiding in the human spirit of each boirn again member of the Body of Christ, the Restrainer is not out of the way unless those in whom He abides are taken out of the way. This harkens back to the time of Lot, and the Angel tellig Lot that he could not do anything until Lot was out of the way, in Zoar.
Those in whom the Holy Spirit abiudes would subject The Holy Spirit to the wrath of God if they were not removed 'proton' / first so the man of sin can be revealed. I have been studying the nuances of this passage for quite sometime.
You are correct, and that's the way I've heard it explained as well.
Just goes to show that even the King James Bible, which I've always espoused as the most accurate bible we have, can have errors in it. Lately I've come to rely on the Geneva Bible as more accurate, even looking back at even earlier versions of the scriptures.