Right, this is old news. It WOULD be interesting if other astronauts felt the same, and had information to back up such claims. My guess is that most astronauts are somewhat embarrassed by Mitchell, but don't say anything out of respect for a fellow astronaut.
Thats not to say that Mitchell isn't right, he may be, but for the media to continue bringing up his name as a UFO "advocate", lets just say its getting quite old.
Actually, IIRC,
6-10 astronauts have come out on the side of UFO & ET realities in the last year . . . some for the first time.
Some have decried earlier recants of such disclosures.
Mitchell is one of quite a group, now.