No thats the deck color. They use red.
Check out this photo taken onboard the Moskva decades ago.
https://www.reddit.com/r/WarshipPorn/comments/l4mgf5/onboard_the_cruiser_moskva_during_minor_refit_and/
The deck seems to have been rust colored even then.
Is it actual rust, or rust-colored nonskid? You make the call.