Buried gas lines flex connections

Has anyone else experienced gas companies inspecting homes to check for flex connectors? Some homes in our community have burried supply lines from the gas meter to the home. They are want us to install flex connectors. It is unclear if we are required to make the change and who’s responsibility it is.

This connection is between the gas companies buried line/meter and the home therefor it would be my opinion that it is the responsibility of the home owners to provide the required connection. I would inform the home owners and include the letter from the gas company.