No, you're not talking about business-to-business. The landlord is not a business but an individual. Therefore, your exemption clause has no legal effect, and you still need to bear the problem. If the elderly get sick or die, we need to undertake certain compensation agreements. As employees, we also have social security obligations.
In addition, the law stipulates that the elderly can only avoid some risks by writing a letter of exemption. Greater risks cannot be avoided in this way, in other words, they cannot be avoided, and it is recommended not to use them.