Let us be clear, long distance pipelines already exist. The technology is established.
Now a naval blockade is one thing; in that it can be threatened, started eased up, eased down and finished.
However launching a sustained attack on inland infrastructure, of such severity that it can not be readily
repaired, with high speed missiles is technically possible but very likely leads to full scale war.
Is the USA going to start WW3, that would likely go nuclear, over Taiwan ?
I suspect the reason they have not already built it that they are haggling over terms.
We are assuming that a Wars gone hot because China gas invaded Taiwan perhaps with a first strike on Guam or sonething.
Even if tgey play it safe and don't shoot at USAfirces a pipeline is still hypothetical.
Since US missiles can hit individuals in a car these days they xan hit it.
Any such hypothetical pipeline would need togo where the fuels needed. That's eastern China.
USA coukd hit ot pretty much anywhere though at least in range of a B2.
Not counting any missiles whoose exact range is a state secret.
USA invading Chiba xsnt be done by time soon that's WW2 levels of mobilization. Blockading South China Sea very iffy.
Indian Ocean/Persian gulf China can't do much.
Even worse tgey haven't been to war since 1979 abd tgat was a shambles. Their carriers are basically a joke and tgey have no institutional knowledge of using them in an actual conflict. And they don't have effective dedicated naval planes in any event.
USA weapons are a generation or two ahead of what they've been supplied Ukraine with.
Chinas energy supply could be constrained to domestic production and Kazakhstan. Assuming that pipeline doesn't get hit.
And Taiwan has indicated they'll fire missiles at the 3 Gorges dam.
China still doesn't gave the technological edge over Russia in several cases. Jet engines being one. It's why they don't have an effective naval fighter. They cant launch anything with a USA style combat load.
When you're reliant on shipping whoever controls the waves (hint that's USA). Ironically China benefits from the USN.