What is your point here? That Deku didn't generate 25 tons worth of force in his jump simply because the ground didn't break? You do realize that 90% of fictional fights fall under this category right? Using destructive capacity as an excuse does not mean the feat can't be counted.
Deku isn't lifting "three times" the weight of that I-beam. Subtract 15 from 25. The difference is not 3x. In fact, it's only a 60% difference. And combined with the acceleration here, and the fact that he's at the center of the beam, along with that he had to catch it at the last second, AND the fact that there's a difference between generating force through acceleration and deadlifting, it would be significantly harder to lift it.
To set an example about what I'm talking about generating force through a deadlift compared to acceleration, if you factor in the acceleration of the I-beam that Deku is holding, which is 9.8 m/s^2, and multiply by the I-beams weight, Deku's arms would've had to support over 147 metric tons worth of weight. That goes to show you just how much of a difference acceleration matters when trying to catch/lift a falling object. And of course, this is ignoring the fact that at one point in the Two Heroes movie, Deku managed to break out of SOLID STEEL with his bare hands at 5%. The lifting strength required to do that is way over hundreds of tons.
Hell, you got Deku being able to crush solid concrete with his bare hands at 8%, which alone would require hundreds of tons of force. And that's just the grip strength of the muscles in his hands when enhanced by One for All.
Also, is anyone gonna talk about how logically speaking, Deku struggling to lift a 15 ton I-beam would be an outlier compared to the feat being challenged?