GOP has been off of redistricting for years and years, so this is nothing new. Hell, if it wasn't for the lines being drawn to their advantage, the GOP probably wouldn't even control the House...they frequently get overall less votes but win anyway.
Democrats are too cowardly to make any real effort to do anything about it tho.
Dems are more "packed in" that's why they often under-perform in seats compared to their total vote share.