Yes. We can continue to hold reservations but that can be considered evidence. It is akin to someone getting killed and someone else prior saying they would kill that person. It doesn't mean they actually did it, but it is suspicion and motive that should lead to further investigations. That Germany and other countries aren't looking into it can also be considered circumstantial evidence.
It‘s not evidence because the pipeline wasn‘t that important anymore. They also looked into it. And finally any of them could have done it themselves as well. Nothing points to the US specifically.
For the US such an operation would have a huge amount of risk and they have to gain nothing until the war is over and even after that very little or nothing. (Potentially they can sell their gas - but others as well.) So why do it?
On the other hand, Germany had to gain a bit (shutting down the voices calling for it being opened) and Russia had to gain a lot (sowing distrust within NATO; forcing a change from NS1 to the remaining NS2; as a show of power and a threat; making a strategic change impossible to shut down future opposition within the power structure of Russia) or just to complete their shift to trade with China now instead. The NS2 project was already dead.)
The US runs no risk at all in doing something like this.
They've been doing war and killing innocents ("collateral damage", sorry...) for decades, all in the name of some doubtful "freedom and democracy", and what has happened to them? Nothing whatsoever.
Your original claim, which was an opinion stated in the form of a fact, was that it is a Nothing Burger.
Stating one's opinions on social media is generally fine, but stating them in the form of facts is dangerous in that it can cause other agents in the system to have incorrect state, which can have very serious causal consequences, up to and including death, which most people claim to be "a big deal".
It is counterintuitive to think in this way, but many useful things are counterintuitive.