Isn't that a pretty silly thing to say? Not being able to test for it is one of the reasons science can't explain it. If you claim science has explained it then you should be citing these tests.
Science has explained (to at least a fair degree) all the parts it recognizes as valid.
Again I know this dance, I've danced it many times. We're talking about a soul and people are going to dance around that term, obviously talking about it while doing their best to avoid saying it directly with a fervor.
There is no such thing as a soul, so science doesn't have to explain it. People are saying science can't explain this or that when they really mean "Soul."
All of this is just that, every time we talk about it, it is all just a pantomime, shadow theater, house of cards facade put up around that.
Neurology is an established science, I will not waste my keystrokes explaining how at least the broad outlines of how the human brain operates have been built. Whatever hair split definition of "consciousness" you, me, or any other Tom, Dick, or Harry want to use it comes from the normal functioning of a human brain. This is no longer up for debate.
If you add something to that, some unexplained, (it's a soul), undefined (it's a soul), vague (it's a soul), "You know that feeling that you're not just your mind..." (it's a soul), "Oh so I guess your comfortable just being a bag of meat and electrical impulses" (it's a soul) to it and demand science explain
that it can't. Because it doesn't exist. Because it's a soul.
The Woo Slingers are mad because "The Human Condition" was one of the last gaps they got to shove their Woo into and now they have to change tactics to pretending the gap is still there by making up stuff we need the gap to explain that is silly word games or distinctions without difference.