Not seeing much carbon on the bike, the parallelogram on the RD, the brake levers, seatpost & fork blades, not possible to tell what the steerer is made from.

For using carbon with steel, I have had a 531 frame with a similar setup, carbon seatpost & au/carbon forks since 2000, feels just fine, but then each ike can ride differently, and the tubes on that frame are oversized Deda EOM 16.5, so it will feel different to 531.