Yes, they are explaining what I noted. When they made the contributions, they had 1 account or 2 accounts. They used the HSA account(s) for receiving contributions simultaneously or concurrently or consecutively, or decided that the contribution should only go to the HSA for the person having the policy, each time.

Since these were always family plans, it doesn't matter if they only had 1 account or who had that one account vs the policy. What matters is that their combined contribution doesn't exceed their allowed contribution. The employer share, if any, from payroll, is treated as from the employee, as well.