Deads work the lower back of course as a stabilizer. They shouldn't "hit" the lower back in terms of a prime mover. So if you "feel the burn" in your lower erectors all the time after deads that's not such a great sign. Unless you are doing some incredible volume and even then I think your lower back would just fatigue before that happened.

Extensions in the way Pity mentioned can help the lower back but building up local muscular endurance. That is, using the glutes and extending at the hips but maintaining the torso straight. Which means that your lower back must work hard as a stabilizer..to keep you rigid.

But you don't necessarily have to do them right now. As long as you progress well on deadlift and maintain good quality.

At some point, certain things can become "weak links" or limiting factors and then you may need to add stuff like extensions to help get past them.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.