So I'm going to mostly be replying to the pictures...
100% NOT a full tang. There is a tang visible where it enters the guard, but it is SMALLER than even the side pieces.
You must be the only person in America without a magnet on their fridge.
Couple red flags...
The fitment is... sketchy. The fact that the tang is visible in front of the guard is one. On a non-full tang weapon, the shoulders where the blade transitions into the tang should be rounded (those cannot be seen in your photos) and covered by the guard. The guard should be flush against the blade, or overlap it a bit.
@Flying Crane talked about this as well.
Those side bits are not fitted any better than the blade-to-guard. All those little gaps are rust points. If you have no rust, there is a very high probability that it's not even steel. It could be stainless or aluminum, but those do rust too, eventually.
And rivets??? If this is something traditional in China, ok... I guess... but from a functional standpoint, this is horrible. You're drilling holes near the tang. Which weakens it, in the area that is already most prone to breaking, especially with a partial tang weapon. You cannot loosen rivets, but they can loosen over time. You cannot tighten them. If I wanted to put bits like that on a weapon, they'd be part of the blade. Not tacked on. If there as a reason (tradition or something) that required them to be tacked on afterwards, they'd need to fit the blade better. I'd like to assume that those were fitted properly and have bent over time. That's possible, but given the poor fitment of the blade and guard, I suspect this is how they've always been.
I'd like to see what the magnet test shows.
Having said all that, I have to admit that it's pretty difficult to find a really well made sword these days. And the issues with yours are not the sort of things most people would ever think of, or notice.