However, the article says about its first anecdotal subject:
Kevin, who is now 5 years old, became frustrated quite easily, threw temper tantrums and became unruly at his day-care center.
Although more detail is not given, "day-care center" implies 10-12 hours a day, five days a week.
It's true that many children are not being disciplined by their parents, and one reason is that they're rarely WITH their parents!
Your are correct. This is an all-day day care center and not a two or three morning a week pre-school.