I certainly don't discount that Russia could have done it. Not just for bad relations within NATO. Perhaps more to create an energy crisis in Europe ahead of the winter. But if you could find an actual video of Putin literally promising he will blow it up and pretend it was the US, then this would help your case. There doesn't have to be a knowing smile at the end of Putin's promise. Though, again, this would help your case...
Biden never said US will "blow up" pipelines. He said NORD2 will not become operational AND IT DIDN'T - legally and peacefully - European money was withdrawn, the company went bankrupt and the project was rolled up. It was dead an buried - no need to blow anything up.
Russia greatly reduced any gas pumped through Nord1, so there was no need for US to blow that up either.
It's honestly sad to see European leftists become animated and happy when Putin injects anti-US propaganda into your social feeds. You immediately jump from "really?" to "for sure" - stuttering Biden has "said so himself."
I will venture a guess you live in a safe European country and never even consider that a bomb or a missile can land on your street. If and when it does, your mostly armless government will call hated Biden and beg him to help you free yourselves from aggression.
When you will say Putin is weak and his armies won't reach your country, keep in mind that drunk, sick and emaciated Russian soldiers will still outgun you with your kitchen butter knife and your three man army.
It's not the nonexistent European "rapid reaction" forces that were mobilized to Romania, ready to deter Russian aggression in your lands - it's American 101st airborne division - and if need be, those American men and women will engage RF and will fight and die - for you, goofballs and your countries. Do you believe that those mostly young men and women, with families and children back home, want to be in Europe, prepared to die in yet another ****ing European war?
And if even now you feel that you are already safe, your countries should leave NATO immediately, freeing us from our treaty obligations to defend your sorry asses. Your defenseless lands will be easy trophies for RF - but don't you worry - we will totally send you blankets and MREs - but not weapons, since we wouldn't want any further escalation with Russia on your account, would we?