It might be more accurate to say there are believers on earth through and after the Great Tribulation. Not necessarily the Body of Christ or the Church.
The Church is clearly understood to be those believers in the Church Age who are characterized as being indwelt by all three persons of the Godhead.
When the Restrainer is removed, this might be the case that there are believers, but not indwelt by God the Holy Spirit.
“When the Restrainer is removed, this might be the case that there are believers, but not indwelt by God the Holy Spirit.”
Your interpretation hinges on the term “Restrainer” which you take to mean the Holy Spirit. I would submit to you that the verse which speaks of the restrainer is not speaking of the Holy Spirit, but of God ordained secular authorities which will be swept out of the way to make room for the reign of Lucifer.