I dought its a red oak deck likely PT pine. Cabots oil is good,
failure of stain is often not following instructions, like it gets to
cold at night-50 , or was damp, or moldy. Bleach Kills mold cheaply.

Right...I said it was red cedar in the very response you quoted...

I know there are a handful of reasons it may have failed, but right
now I'm just trying to figure out how to fix it.