Planet X = A new world --order In our face for a century

Do you mean their NWO only comes after the cataclysms caused by the passage of Planet X? Why the century?

A new planet "X" is going to devasate the old one we are living in in other words a new world (planet) order

No there is no actual physical planet X it is the new one world order dictatorship taking over the whole Earth iE a metaphorical new planet - planet-X .
They have boasted/warned about it for centuries...

Centuries like nostradamus quatrains, 100 year heartbeats of prophecy.
Marking time untill the great works come to pass.all that effort will come to nought only herald the tribulation and their eternal demise.