(G) Pandemic which is an outbreak of a disease that occurs over a wide geographic area, affects a significant proportion of the population, causes a substantial and unforeseeable threat to the public health, and materially impacts the ability to conduct business, provided that this subparagraph shall only apply with respect to a qualified project first certified pursuant to paragraph (2) of subsection (b) of this Code section on or after July 1, 2023; but such term shall not include any event or circumstance that could have been prevented, overcome, or remedied in whole or in part by the taxpayer through the exercise of reasonable diligence and due care, nor shall such term include the unavailability of funds.