In the Gita we see that even after the attainment of any loka one has to come back (as a human being) - Aabrahma bhuvanallokaah (8.16) and Ksheene punye martya lokam vishanti (9.21).

It seems therefore that liberation/moksha is possible only during human birth (Jeevan Mukti) or just after (videha mukti). Is this true ? In other words do we have any evidence that suggests that liberation/moksha is not possible in other births - even of devas etc..?

Note: Vivekachudamani does extoll human birth a lot, but does not specifically say that liberation/moksha is possible only during human birth. Or am I mistaken ?