It doesn't invalidate the original claim, as they haven't been able to make a pure sample to test with, as I understand it. Or at least that there is some difference between their samples and the others, but still it shows promise.
If they've made a novel superconductor, then that's pretty huge anyway, it opens new pathways for exploration, right?
Maybe it helps unlock the secret of what makes a superconductor superconduct, which could then be used to make other, more useful superconductors
That supplemental video files and drama around submission process seemed to exhibit telltales signs of forged science, so the fact that this seems not nothing and is getting material scientists excited is exciting.