Like you, I agree the Holy Spirit is the Restrainer mentioned in 2 Thessalonians 2. It fits the data, that at the rapture, the Holy Spirit will no longer restrain Satan, and all hell will break loose, literally. But your article got me thinking, and in particular about the book of Job. In the first chapter we see that Satan presents himself before the Lord, and as you know, the Lord asks him to consider Job, His servant. Satan is “allowed” to do a lot of things to influence Job’s relationship with God. Satan could have done much more, but God restrained him from doing all that he might do. Applying this to the Restrainer, I wonder if an argument could be made that God Himself is the Restrainer. He certainly was able to directly control what Satan was allowed to do, and that could still be true today. It even fits with your Genesis reference where “there would come a time when His Spirit would step aside and allow a time of judgment to proceed.” Couldn’t we see that also being fulfilled after the church is removed? Yes, He could still be doing the actual restraining through His Holy Spirit, both then and now, but it puts the control in God’s hands.
In the overall sense of things what you say is correct. But I wonder if you understand that God, the Spirit of God, and the Holy Spirit are one and the same. God detailed to the part of Him that is His Spirit the task of restraining evil in the world, just like He detailed to the part of Him that is His Son the task of coming into the world as a man to redeem us from the bondage of sin.