It’s not terribly hyperbolic. The headline is that they tamed the protein (MYC). That’s more or less true, they found a molecule that binds to and blocks MYC’s activity. Then in the article they (correctly) note that MYC is dysregulated in 75% of cancer cases. They don’t claim that that they cured or tamed 75% of cancer.
Finding a MYC binder is legitimately a big deal. It’s been known as a primary target for cancer for decades but there are zero drugs that block it. Now this shows the way towards drugging it. It’s a big advance for the field.