Yeah the estimate of trans people is something like 0.3% of the population so the number you calculate is showing that transgender people experience a lower murder rate than the general population.

I don't know about murder specifically but the vast majority of violence experienced by the transgender community is by MtF prostitutes. The second highest category is domestic violence which is just them fighting with each other. If you look at the remaining population there is a vanishingly small number of them experiencing violence.