read the verses, brightfame52. They tell us that if satan and his minions had known the mystery, even the hidden wisdom they would not have crucified the Lord Jesus Christ.
You have agreed that it is satan who has hidden the gospel as revealed in 2 Cor 4:4 ... so satan has known the gospel in order to hide it from mankind. However, if the gospel is the same as the mystery, the hidden wisdom, you've now got satan privy to information God tells us He kept hid (Rom 16:25; Eph 3:5; Eph 3:9; Col 1:26). You must have a very low opinion of God if satan can ferret out information God tells us He kept hid until He revealed it to Paul.
God tells us that if satan and his minions had known the mystery, the hidden wisdom, satan and his minions would never have crucified the Lord Jesus Christ. If the gospel = the mystery, the hidden wisdom, then your Bible falls apart at 1 Cor 2:8 because God tells us that satan would not have crucified Jesus if he had known. Clearly the mystery, the hidden wisdom is not the same as the gospel ... and you can continue to conflate the two and end up not understanding either the mystery, the hidden wisdom or the gospel.