Yes, hence why they are drawing so many of the new districts to include as many incumbent Republicans against each other as possible, including one with 3 in the same district. They can't draw them anymore geographically, save the urban areas, where a Democrat is guaranteed to win, so they try to get rid of the incumbents this way instead - in particular they are targeting the newer, younger GOP members.
As long ago as 1969, the GOP elected a House Speaker (the first in the South since the 1890s). When the Dems gained a few seats in 1971, they got control of redistricting and spent the next several decades trying to hold the GOP to at or around 1/3rd of the membership. The GOP would usually edge up to or over 40% of the body over the next decade before getting screwed again.
Around 1994, GOP candidates for the TN House started receiving more votes than their Dem counterparts, despite being outnumbered by a roughly 60-40% majority. Republican members would routinely win by huge margins in their carefully-drawn seats to corral GOP voters, while Dems (in contested seats) would tend to win by uninspiring %’s. By 2002, the RINO Governor Sundquist was enraged at many GOP legislators for failing to enact his (illegal) income tax.
What did he do ? He submitted a redistricting plan that was so audacious (putting about a dozen members of his own party, those most opposed to his income tax, into half as many seats) that even the Democrats thought it was way to punitive (!) and would result in civil war within the legislature. The Dem plan, ironically, only ended up putting 2 Republicans together, which was passed (essentially status quo lines). Under those same lines, by 2008, the GOP got a (on paper) majority and in 2010, jumped to 64%. Today we’re at 70%.
I expect once the KY GOP busts the gerrymander, they’ll reach commanding majorities in short order. Just 4 short years ago, the TN GOP was worried if they’d actually gain working control of the House. Now the Democrats worry that they’ll ever gain enough seats to deny the GOP a super-majority. Barring a GOP split (Tea Party vs. Establishment), the Dems won’t be challenging them for majority status again for decades.