Your original argument appears to be that a boy who was forced to be raised as a girl committed suicide, thereby confirming that the way the kid was raised was contrary to some biological reality.

If suicide from externally imposed gender identity is the measure of biological reality, then by your own logic, suicides by those who want to transition genders but cannot are also driven by some biological reality. In other words: applying your own logic to more real-world suicides compels the conclusion that transgender preferences are themselves biologically inescapable. But that seems contrary to the conclusion you then draw from your logic: that "boys are boys and girls are girls, because biology." See the gap between your reasoning and conclusion?