It is one of the more obvious misinterpretations of the WT.
The passage is literally saying not to speculate about when the destruction would come, insisting that it will be as unpredictable as a thief in the night and that there will not be a sign. (written before the Gospels) Everyone will be going about life as usual in peace, no terrors, no warnings. Then the advice is that Christians be always "awake" so as not be caught off guard.
It is hilarious actually that the WT and others before them spun the very verse into a sign, a sign of no signs! They lift the phrase "peace and safety" and create a new global event/sign to watch for.
It's like my doctor telling me there are no warnings for cancer to occur, it can happen when least expected, so I interpret my lack of symptoms as a sign of cancer.
On the converse, Paul seems to be saying assume that any day you will get cancer. I'm not sure how healthy that is.