That’s what it says. Revelation 20:7–8 (ESV): “And when the thousand years are ended, Satan will be released from his prison 8 and will come out to deceive the nations that are at the four corners of the earth, Gog and Magog, to gather them for battle…”
Wasn’t sure what you meant - as you just ended the sentence with “millennium” - which one ended 22 years ago (almost 23), or the millennium reign of Christ.
Thank you for clarifying.