It's right, but it's kind of a non-sequitur. It seems to be a response to "you should be homeschooling your kid", which sequoia didn't actually say. They suggested the problem is "school taking up 100% of her time, energy, and attention", and obviously homeschooling is how they are addressing it themselves, but you can imagine other solutions. Off-hand:

* For starters, school doesn't last until 6:30pm unless you let it. Extracurriculars are extra. If you need afternoon child care (and most of us do), there may be less directed, more creative options available.

* Schools can make changes, and you can encourage your teacher / school / district to do so. Less homework (an idea which has some science behind it iiuc) at least. Maybe a later start time (although this runs into tension with parents' schedules).