I don't know where that linked dataset is from, but almost every claim I've seen for the LCoE of wind/solar being lower than any fossil fuel source excludes the cost of energy storage. Latest estimates[0] put solar and wind roughly at par with combined-cycle gas plants, but without the cost of addressing intermittency.

Plus, it would be probably unwise to extrapolate the current downward trend in costs for the relatively new technology (meaning early in its marginal cost curve) of utility-scale solar and wind that it would continue to get much cheaper.

The two factors combined would suggest that current energy policy in Hawaii is likely to result in increased costs for the consumer down the line.

[0]: https://www.eia.gov/outlooks/aeo/pdf/electricity_generation....