According to wiki we broke that record playing 8 in the indigenous round in 2017.
“The Fremantle Football Club initially under inaugural coach Gerard Neesham, have been big supporters of indigenous players. They have had 34 indigenous players represent their club in AFL matches, with 11 of the 2018 list of indigenous representation.[2] They set records for the most number of indigenous players in AFL/VFL matches in 2003, with seven players, in an 83 point win over the Western Bulldogs[3] and then again in Indigenous Round (Round 10) 2017 with eight players.[3]”