Lucy's knee joint (ie the true story): http://www.talkorigins.org/faqs/knee-joint.html
Leakey even said in 1983 that no firm conclusion could be drawn about what species Lucy belonged to.
What did he apparently say, and where did he say it. It's no use for these websites to make up these claims without reference. It is likely BS. The consensus is that it is Australopithecus afarensis (and other fossils of this species are known)
They are also typically selected about what research they mention: http://www.talkorigins.org/faqs/homs/a_piths.html