I still firmly believe it's only the gymnasium and baseball stadium being knocked down. The club haven't mentioned anything to the supporters and we had dinner with them less than a month ago. Only two years ago they replaced 80% of the seats with brand new flippy ones with arms, rescreeded the surface of the seating area and installed an enormous jumbotron. I doubt very much it's going to be demolished this season.
Historically the I'Park have usually played one game at the Gudeok per season. In the past it's been against Gyeongnam and billed as "the classic match" for provincial bragging rights. One time Girls Generation even provided the half time entertainment: https://www.youtube.com/watch?v=3Db_8F90xGY
I assume it's just that type of event again with Jeonbuk subbing for relegated Gyeongnam.