Acausal free will is not in line with indeterminism. Indeterminism is basically because (as far as we know) there will always be a limit on our knowledge of the state of the universe, not that anything in it at a human level of significance is acausal. E.g., acausal describes the decay of radioactive particles, not the functioning of human brain cells.
Applying acausality at the human level is attractive because it allows us to blame people and deny all responsibility for our part in the system, when the reality is that what we do next is determined by what happened before plus a bit of noise. We can say people are responsible for something, but not blame them; what else could they have done other than what they did?