The highlighted part is boilerplate. You find the same language in DM study after study after study after study. *We didn’t find DM but, yeah!, we narrowed the constraints. Send us more money!* And they’re “very excited about what we’ve been able to do so far.”New research uses coaxial 'dish' antenna to scan for dark matter
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A new experiment by a collaboration led by the University of Chicago and Fermi National Accelerator Laboratory, known as the Broadband Reflector Experiment for Axion Detection or BREAD, has released its first results in the search for dark matter in a study published in Physical Review Letters. Though they did not find dark matter, they narrowed the constraints for where it might be and demonstrated a unique approach that may speed up the search for the mysterious substance, at relatively little space and cost.
Now each experiment is narrowing the constraints just a little. If that’s the case, they’ll never ever totally rule DM out, will they? It's the perfect scam. The only good thing about this lastest experiment is that it cost “relatively” little … or so they claim. How much, exactly, they don’t ever spell out in any source I found. There’s a tendency for mainstream DM scientists to misplace that information these days. I wonder why? (SARCASM)