I'm not sure your logic follows through - just because something is taught in middle school doesn't make it gender neutral. Most of the subjects you mention have similar gender issues to what is presented here, with similar discussions taking place in related communities.
The problem goes deeper than just introducing the material at an appropriate age.
Teaching something to kids at a young age certainly does not make the whole industry gender neutral, but it allows girls and boys to learn something together, lessening the bias that they will learn when older and logically able to understand the gender inequality in any specific industry (and hopefully by the time they are actually that old, the ratio will have lessened). And yes, other industries might be facing the same issues, but the numbers are certainly not as depressing as the ones in CS and CS related fields.
The problem goes deeper than just introducing the material at an appropriate age.