>>96285509
Yes, not immediately, but he'll eventually get there.
An Astartes is evolutionarily superior to any normal human, both physically and intellectually.
They have a longer lifespan than any human, with one case of an Astartes (a normal one, not Primaris) reaching 10,000 years of age, and his body still refused to let him die (even though his body was very aged).

First, he'll focus his efforts on conquering the planet. It will probably take a few centuries, but eventually, everyone will bow before the immortal king.
The next step would be to use all the planet's resources to communicate with the Imperium or create ships fit for star travel, as well as a few regiments of soldiers as an offering.
Now, the only question remains: whether he'll stay to rule the planet or return to his chapter and use the planet as a recruiting planet, or give him his own Space Marine chapter.