The idea that "dark matter" is composed of extremely light particles that have quantum effects on the macro scale of galactic dimensions seems worthy of study.
However, I think theories like this about how that could explain the observed deviations of the LCDM model from observations is really premature. We are not even sure that there is "dark matter".
Hopefully, such musings will not get sucked into the LCDM model without better verification, using the excuse that "It is the best we can think of, so it must be right."
When you have a theory that constantly needs the addition of more free parameters to tune it to new observations, it is clearly time to question the whole model.