Critics Claim that President Lee’s Attempt to Relocate Gwangju Airbase is Sacrificing Defense Needs for Politics
It does seem to make sense you want the alternative airfield built before closing Gwangju Airbase, but with the current timeline for closure being 2028 I don’t see how a new base could be built in time:

“Airpower is what North Korea fears most and Gwangju is a base the U.S. military actively uses. It is concerning that the plan is moving ahead on schedule without a clear alternative prepared,” Yang said.
He questioned the timing, suggesting the decision appeared aimed at shoring up political support in the region rather than addressing a defense need. “With Korea-U.S. alliance issues piling up, designating Gwangju specifically suggests the goal is political — holding onto support in that region,” Yang said, adding that pursuing the plan for political reasons is not inherently wrong, but that it becomes a problem when it interferes with matters of security importance.
Park Won-gon, a professor of North Korean studies at Ewha Womans University, noted the base holds significance beyond the immediate peninsula context.
“Sites like the Gwangju base feature hardened aircraft shelters designed to protect fighter jets from preemptive strikes, preserving combat power for counterattacks in a potential U.S.–China conflict. The same logic applies to deterring North Korea, where overwhelming airpower is essential … Joint bilateral consultations are essential to determine the strategic risks,” Park said.
You can read more at the link.


Of course Lee wants to appease Beijing and Pyongyang…