No it does not make any contradiction with Jesus' clear and unambiguous statement about the great tribulation which climaxed the Parousia.
Scholar,
That is why the gospels say: Tell US.. What will be the sign of your Parousia? —Which those with spiritual blindness cannot see. —Like the Pharisees who asked Jesus for a sign from heaven rejecting all his miracles and teachings and even his resurrection ( you did not discern the day of you being inspected ) Divine disfavor was manifested in 70CE but even today “Jews” refuse to see any correlation between 70 CE and Jesus.
The WT has published that today people refuse to see the sign of Jesus’s Parousia by not responding to the good news and becoming subjects of the theocracy and that makes them fighters against the kingdom, therefore, ALL will be forced to see when the son of man is revealed. They refused to see mentally but when the sign of the son of man appears in the heaven-indisputable proof from God- they will know, the will have to know. So, according to JW, the sign includes war, famine, persecution, preaching, destruction of bogus religion, the great tribulation, and finally miraculous convincing evidence which will also prove what JW have been saying all along: (They took no note until the flood came and swept them all way.) So when it hits by this time you don’t need the sign. The sign was there all along. That is how we at JW see it.