You can turn it off. This is just a poorly worded FAQ.
At the beginning, there is an FAQ that says you can't turn off ads in scenic mode.
Q: Can I turn Scenic Mode ads off?
A: No, not at this time...
But in fact you can turn the Scenic mode off completely, but it buried later in the content of an FAQ about settings. Q: Can I change any settings for Scenic Mode?
A: Yes. To use Scenic Mode with or without volume, navigate to the left side menu on the VIZIO Home screen, click Settings > Extras > Home Page Settings > Scenic Mode. Once you’re in the Scenic Mode section of Settings, scroll down and select either Volume On or Volume Off. You will see a checkmark appear, noting that you’ve correctly selected your setting. If you want to turn off Scenic Mode completely, follow the same instructions to get to the Scenic Mode section of Settings and select Disable.