Yes, it will.
Tight hip flexors are what beat up on your lower back. Remember, tight hip flexors create an excessive forward tilt leading to tight muscles of the low back. In way, tight hip flexors make your lower back get over used.
When you unlock your hip flexors to proper length, it will make it easier for you to keep your spine in neutral. Keep doing on Unlock Your Hip Flexors program and your back ache will be cut in half, but will probably disappear.
Do the routine every day and it will literally change your life!