He's still looking a bit pink.
Today Sega released more gameplay of Flying Battery Zone and this time we're able to see Knuckles peruse through Flying Battery in a 1 minute video shown below (plus screenshots including Sonic and Tails).
Wed Aug 24, 2022 11 d
Wed Sep 28, 2022 46 d
Wed Oct 19, 2022 67 d
Wed Oct 26, 2022 74 d
Wed Nov 30, 2022 Tentative
Fri Dec 20, 2024 860 d