That certainly isn't true around here. I was a guardian and the Head Start teacher I knew best had a bachelor's degree. I saw job postings and a community college degree was required. The assistants don't generally have either of those.
Also, to those who say it is a daycare program: again that wasn't the case here. I sat in many times and observed active teaching appropriate for the age group with good resource materials. The kids also learned things like table manners and cleaning up the table and play area. You can say it isn't worth the money but what I saw was good quality. No idea what the programs are like in other areas, especially urban zones.
The head start programs I was familiar with were the ones I had to rate for a child care management agency....and they were exactly what I described. Now that was 15 years ago and they could have changed. I never ranked them well but one positive was it probably was a better environment than where they lived and that was not saying much. :/