Internal panel protection from Hyundai

Just sent my 2022 i20 for its annual service and the service manager was trying to ask me to do “Internal Panel Protection”. Was very sweet talking and everything so I told yes and asked to send a cost estimate. On the estimate he sent, it costed like 3.5k after taxes, so I asked for more information and he was like this is needed for “lubrication of suspension” and stuff like that. Felt like he was bullshitting. I told him it’s not needed and asked him to remove it. He removed it from the estimate, but his tone immediately changed. Felt like he was expecting good commission on that. Does anyone know what this is? And if it is needed? Service centre- Trident Hyundai, Hosur Road, Kudlu Gate, Bangalore.