Lin Mu wouldn't say that he was an expert at the anatomy of many races, but he had seen enough of them over the years that he could somewhat comprehend a new one and not be in the blind.
In the case of the Haima tribe, their other than their body's meridians and Dantian being more focused on the legs, the rest was the same as that of a human. But that didn't mean that the same cultivation techniques could be used by them.
If they tried to use them forcefully, they would quite possibly end up injuring themselves, or if they were lucky they simply wouldn't be able to use the technique in the first place.
Lin Mu explained all this to Elder Niji, letting him understand the intricacies of the Haima tribe people.
~Sigh~
"Seems like we are still at a loss…" Elder Niji spoke and shook his head.