Teachers toilet training

I was saddened to read the article about teachers needing to toilet train children and to teach them basic words. Reading the article it stated that the families speak English and there are no disabilities. It was a rule when mine were young that you could not attend nursery school age 3 if not toilet trained. I understand Covid must of had an impact as parents working from home and trying to home school at the same time would have lost valuable time with the younger children. I do think it needs addressing as the children are missing key stages in their lives which puts them behind their peers. It could be contributing to the amount of teachers leaving the profession. My concerns are how many hours of teaching time do the other children in class lose while teachers are dealing with these issues.