The Comet Research Group is composed of 63 scientists from 55 universities in 16 countries, which support the YD impact hypothesis, and many fewer scientists have written unfavorable papers against the hypothesis, so it's unfair to call the theory debunked. Even so, I go vastly further than they do in suggesting that anomalous slag-like-material with centimeter-scale metallic-iron inclusions is the igneous crust of hot-classical Kuiper belt objects. The one thing it can't be is ordinary iron furnace slag, because on the surface of our high gravity planet, metallic iron globules of that size would pool at the bottom in less than a second, which is the physics iron furnace smelters rely on.
Notice that I merely said, "Compare to suggested YD IMPACT COMET CRUST": since I haven't even completely convinced myself, but on the other hand, this stuff also ain't typical iron furnace slag because the two materials are as different as night and day. And here I'm extrapolating from the metallic iron found by Met2344 (above) to the igneous material with mm-to-cm-scale metallic-iron inclusions (see image below).
Mostly I'm a solar system guy (Snowball Solar System) who set out to try to explain why we have 3 sets of twin planets in our HIGHLY-UNUSUAL solar system (Jupiter-Saturn, Uranus-Neptune, and Venus-Earth, ignoring Mercury and Mars for brevity). A byproduct of the HIGHLY-UNUSUAL planet formation mechanism to explain the 3 sets of twin planets is that there should be a reservoir of siderophile-depleted (low nickel, low iridium) comets, i.e., the hot classical Kuiper belt objects, and this alternative planet-formation mechanism REQUIRES a solar system cataclysm (at 4,567 Ma), which could have melted the crust of the hot-classical KBOs and chemically reduced iron oxides to metallic iron, almost exactly like the process of an industrial iron furnace, but whether this material is that material is questionable even to myself; however, I also can't explain the huge metallic-iron inclusions trapped in igneous matrix in a man-made industrial setting either—
I'm not arguing with the meteorite community about inner solar system meteorites, which are exceedingly well categorized, I'm suggesting the possibility of an unrecognized new category of outer solar system material that has an alternative origin story coincident with Earth's continental tectonic plates, allowing it to hide in plain sight.
Also, note the following image of suggested fusion crust with flow lines, with imbedded spherules, where similar spherules are common in the 'black mat' of the Younger Dryas.