Turns out it does come with the Volumetric Fog snippet in the Unreal Engine 5 Guided Tour tutorial. In the 7th media box (Just below the Runtime Virtual Textures paragraph), you can simply copy and paste the snippet into your material blueprint, and the T_VolumeNoiseErosion32 (Volume Texture) asset will already be included in the Texture Sample.
Just leaving this out in case someone comes across this issue.