I tend to go by the evidence at hand. The evidence that we have is that $SIGO informs their shareholders via an 8K whenever they receive a tranche of the debt facility.
Given the absence of any further 8Ks advising shareholders of their receiving any more tranches, the evidence would indicate that $SIGO's debt is insignificant relative to their market cap, even at today's PPS and especially given that they're a startup in a fledgling industry.