i would tend to trust Andy's words...

The track "Down in the Valley" is included in Christy Moore's magnificent Box Set, green disc, track 15.
It says there that it is a unique recording including the 4 members of Planxty, with Liam o'Flynn singing with Donal, Andy and CM. Does not mention Joe Dolan. Credits say it was recorded in Scruffy Murphys pub in Mount Street in 1972... ??

i guess we would have to wait a day or two for the listen again to work. All the other dates are clickable, it's just a question of hours IMHO.