Ahhhh, answered my own question. It is so hard to take "scientists" seriously these days. [your bolding]
How does someone being honest by saying "may have" when he's not 100% sure decrease his credibility or gravitas?
Because of the first time the subject was mentioned, it was mentioned definitively.
The crater, buried beneath a half-mile of ice and discovered by some serious airborne and satellite sleuthing, is more than twice as big as the one involved in the demise of the dinosaurs.