The above image comes from issue 4, which was very recently released. Previous issues always credit the writer, artist, and (in next-issue previews) colorist in that exact order - normally Jo Mi-Gyeong would be listed second, but Dutreix being there instead all but outright confirms they're taking over for this issue at least. (If you're not familiar with their name, they're most well-known for their work on IDW's Sonic the Hedgehog.)

Furthermore, they've hinted at doing something Murder Drones-related on three separate occasions since April.

This appears to have been a change made at some point during production - Oni's original solicitations said Mi-Gyeong would be doing the art, with the cover(s) provided crediting her accordingly:

BELATED UPDATE (6/21): On the off-chance you didn't read the comments (or check Bluesky, or Twitter), Gigi personally confirmed their involvement with issue 5. In addition, according to the checklist (also at the end of issue 4), they're also doing issue 6's art alongside Jo Mi-Gyeong.