Of what Jesus, God in human form, could see and know, He shared. Back then He didn't know all things of course. But now that He's glorified and sits with the Source of all knowledge He has access to all truth.
Back then Jesus didn't know timeframes, that is, times when things would happen like when He would return. Nor did He know what would happen in His future, who would sit at His left or right in His coming kingdom. But He knows now.
Maybe Jesus didn't know about the restoration of those serving time in the lake of fire or He did but wasn't allowed to share it. Maybe He did and it just wasn't recorded anywhere or it got lost or omitted.
Whatever be the case, I know that every created being will be redeemed and reconciled to their Creator. And Satan will sit at his Creator's left. Like Jesus, I don't know the exact moment of time in the future. I know it's not in this current age but one of the ages to come.