That's utterly nonsense.
Tactics extend the possibilities in any given position.
Say you think it would be a good idea to get your knight to the outpost d5.
But it isn't possible because it can be captured there.
Suddenly you see a tactical trick.
Because of this trick it is possible to bring the knight still to d5.
If black captures it, he will loose a piece due to the trick.
So what first seemed impossible, is now possible with the aid of tactics.
No matter if the positional idea to post the beast there sucks, you found a brilliant way to do it.
Tactics are only the tools that enhance your possibilities.
What is opposite in the story is the element of time.
Time you use for studying tactics, can't be used for studying strategy and vice versa.
If you study both, like Margriet and I do, your garden will look like this:
|TCT||# prbs||circle 1||circle 2||circle 3|