They clearly meant via the use of either sanctions or other political / legal means, which is exactly what happened because Nord Stream 2 never opened.
I think that's far from clear, verging on very naive. They spent the existence of both pipelines trying doing exactly what you described but could not stop them. Clearly they meant bomb it. And, no, I'm not saying they did. As my other comment indicates Russiais just as if not more likelythe culprit.
It is was very naive why did no one take it literally when he first said it? Back then it was very clear what he meant.