Wow! That really does look like it's in good shape. I understand it's because bronze doesn't oxidize as readily but it's not what I picture when someone says 3000 year old sword.
Fwiw bronze does oxidise quite readily, but the copper oxide is not porous, and becomes a resilient copper carbonate.
Which is why bronze and other copper-alloy artefacts are extremely resilient, unless they come in contact with chlorides and get bronze disease.
I can tell you have some experience with old bronze/copper. Most people do not even know what "bronze disease" is.
A lot of people learned about it when tutorials on inducing it on statues of questionable personnalities sprouted up.
Same here. With something that old I was expecting "well preserved" to mean that I could probably make out that it has the shape of a sword.