Reminds me of Mark Spitz trying to make a swimming comeback for the '92 Olympics, a full 20 years after winning his seven gold medals in '72. Spitz might have been more serious than Moses about contending for a medal, however. Spitz claimed to be swimming faster times than in '72, as I recall; the only problem was that other swimmers were bettering his old marks by even more. I recall watching a made-for-TV match race between Spitz and Tom Jager. I found the following blurb on the web in an ABC Wide World of Sports archive (April 13, 1991):
"Mark Spitz begins his very public comeback to competitive swimming with a spot on the 1992 Olympic team as his goal. In this 50-meter butterfly match race, he is soundly beaten by Tom Jager."
I believe Al Oerter might also have been recording PR's during his 1980 comeback, but I'll defer to the many highly knowledgeable commentators on this board to set the record straight on that one.