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I invite you to read an abstract of their work and debate two questions:
a) How come the whole world missed such a conspicuous phenomenon? A conjunction of factors?
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Insufficient data (in the abstract). No co-ordinates or ephemerides given. It is possible for a comet to be in such an orbit that (from Earth) it never appears in the dark sky. Either in twilight or behind the sun. IIRC SOHO detects a few "suicidal" comets every year that crash into the sun without ever being seen from Earth.
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b) Which the implications for the count of potentially dangerous objects approaching our planet?
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Again, insufficient data. One datum point is not statistically viable.