Here is the wikipedia article. The basic idea is that the primordial density of microscopic black holes was high enough that many were able to form stable bound states before decaying through Hawking radiation (similarly to how unstable neutrons were able to form stable bound states with protons during BBN). These "holeums" would be dark matter candidates that would be much smaller than what is ruled out through gravitational lensing experiments (which rule out ordinary primordial black holes that must be large enough not to have evaporated already).
The papers by Chavda that apparently introduced the idea are not well written or formatted, so I can understand why they are perhaps ignored. On the other hand the basic idea seems sounds to me. Is there a simple reason why it is not?