It's a real teaser. The rock type doesn't seem to be like any others at the site but your comment on it being a possible wooden post from an earlier stage is lovely!
I had wondered whether it was a mid-stage geological oddity, where crystal growth formed to make the cut marks while it was half way to complete petrification. That could explain the distortion around the marks.

Did you find your piece of petrified wood or buy it? Fossil pine is fairly plentiful and obviously heavily textured. One of my favourite pieces is pine but it still looks like a piece of wood you could have picked up yesterday.