You cannot pre stain wood and you do have to weather and prep:

Ok. That makes sense. I'm wondering hown to strip off linseed oil that has soaked into the wood? In can remove the surface material but not sure ho...

You will need to strip off what he did and then you can use a tinted stain.

See here for new wood tips and what to use:

Try one of these brands:

1. Live in Wisconsin 2. Full Shade - deck is on north side of house 3. Cedar 4. Lots of mold - this deck never sees the sun in most parts 5. I am ...

Weather the wood and then prep:

It looks opaque solid stain, not semi. You probably need to pressure wash off the loose stain and then recoat with a solid stain: