It is. I recall posting this info a year or two ago on a baseball thread here on FR and then double checking my old media guides to be sure. He definitely got a ring if not two. I was responding to one of the baseball experts we had who was saying Buckner was actually a good player with a decent career and that one incident had completely tainted it.
I think Buckner wrongly gets a bad rap for that game. People forget that the Mets had already tied the game at home when the ball went through Buckner's legs. And nobody seems to remember, or blame, 1) Schiraldi's terrible pitching performance, or 2) McNamara's terrible managing.
That part is definitely true. One bad grounder...