The CPSC said it believes there have been nine deaths of children between 22 months old and 3 years old after the kids gained access to the pools through footholds created by the pools’ compression straps. The children’s deaths occurred between 2007 and 2022 in California, Florida, Michigan, Missouri, Texas and Wisconsin.
The article didn’t mention anything about regulations though. Just that newer pools have found solutions to this issue and that the old ones are being recalled. It seems to be a choice that the company has made and not a regulation requirement