1. It's not clear whether the skeleton goes with the grave -- The excavation was in the 19th century and there are various methodological concerns.
2. It's not clear that the graveyard was for "warriors" -- The number of bodies with serious injuries is low.
3. It's not clear that the grave was for someone of "high rank", particularly in as much as "high rank" modifies "warrior".
4. The paper gives short shrift to the work of language/text specialists. Notable in light of (2) and (3) above.
How much each of these things is a problem is going to depend on deep factual information, but they are not indicative of "excessive concern with minor details and rules".