It is very important that the indigenous peoples receive plenty of funding for sports and recreational activities. So yes, there should be additional funding in sport for the indigenous. This will ensure that they stay healthy and lead a fun and active life. Sports and reacreation are very important for the overall health of a person or group.
1) It is unethical to favour cultures or ethnicities under the law. 2) Indigenous sport is valuable, but cannot be improved simply by boosting funding. 3) This removes an incentive for sporting societies to particularly engage with Indigenous peoples. 4) There are more important Indigenous initiatives to fund than sport.