Who says that? Maybe the exact position wont but the patterns definitely will.
Tactics
Some people in chess club and chess team but they also stated that it will be hard to reach that position.
There are some tactical puzzles that are unlikely to show in real games.
However, solving specific positions is not the only point of doing tactical puzzles. They also help you learn new ideas that directly or indirectly will be applicable to positions in real games.
The reason you should train tactics is twofold:
1: You must learn these tactics. All tactics are based on the same 5-10 motives (depends on how you define a motif), and if you know what a pin looks like, it's easier to use it in your game. The more exercises you do, the more patterns will you know (for example winning a pinned piece by threathning it with a pawn or win a piece there is "defended" by a pinned piece. If you do 2 exercises, you will know 2 ways to win using a pin. If you do 1000 exercises, you will know 1000 ways to win using a pin.
2: Calculation. To be a good player, you must be able to calculate rapidly and accurate. Of course, you don't need to be able to calculate like Kasparov, but it's important to be able to evaluate positions a few moves ahead. Even in strategic positions.
I was wondering how does tactics help you in chess? The reason I am saying this is because people say the tactics you practice online will never show up in a game and it is just a waste of time.