STL files of the spine (Thorax)

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Hello, I am sorry to interrupt you again. I realized again in the SpineFixationWFDK model that the L5Sacrum Driver is commented out.

In the SpineFiaxtionWFDK model l used this information some time ago and didn't implement a L5Sacrum Driver.
When I do exactly the same in eth-model it works as well here.

#if BM_TRUNK_LUMBAR_RHYTHM == OFF

AnyKinEqSimpleDriver SacrumPelvis =
{
AnySphericalJoint &jntsacrumpelvis = Main.HumanModel.BodyModel.Trunk.JointsLumbar.SacrumPelvisJnt;
DriverPos = pi/180*{0, 0.0, 0.0};
DriverVel = pi/180*{0.0, 0.0, 0.0};
Reaction.Type = {Off, Off, Off};
};

// AnyKinEqSimpleDriver L5Sacrum =
// {
// AnySphericalJoint &jntsacrumpelvis = Main.HumanModel.BodyModel.Trunk.JointsLumbar.L5SacrumJnt;
// DriverPos = pi/180*{0, 0.0, 0};
// DriverVel = pi/180*{0.0, 0.0, 0.0};
// Reaction.Type = {Off, Off, Off};
// };

AnyKinEqSimpleDriver LumbarL4L5 =
{
AnySphericalJoint &jnt45 = Main.HumanModel.BodyModel.Trunk.JointsLumbar.L4L5Jnt;
DriverPos = pi/180*{0, 0.0, 0};
DriverVel = pi/180*{0.0, 0.0, 0.0};
Reaction.Type = {Off, Off, Off};
};

AnyKinEqSimpleDriver LumbarL3L4 =
{
AnySphericalJoint &jnt34 = Main.HumanModel.BodyModel.Trunk.JointsLumbar.L3L4Jnt;
DriverPos = pi/180*{0, 0, 0};
DriverVel = pi/180*{0.0, 0.0, 0.0};
Reaction.Type = {Off, Off, Off};
};

AnyKinEqSimpleDriver LumbarL2L3 =
{
AnySphericalJoint &jnt23 = Main.HumanModel.BodyModel.Trunk.JointsLumbar.L2L3Jnt;
DriverPos = pi/180*{0, 0.0, 0};
DriverVel = pi/180*{0.0, 0.0, 0.0};
Reaction.Type = {Off, Off, Off};
};

AnyKinEqSimpleDriver LumbarL1L2 =

{
AnySphericalJoint &jnt12 = Main.HumanModel.BodyModel.Trunk.JointsLumbar.L1L2Jnt;
DriverPos = pi/180*{0, 0.0, 0};
DriverVel = pi/180*{0.0, 0.0, 0.0};
Reaction.Type = {Off, Off, Off};
};

So my question is, why do we have to comment it out? I know there are posts about it. I searched under "L5Sacrum" and I found this post (L5Sacrum joint in FDK ) where you referred to another post -> but the link in this post doesn't work (like all the old links I click in the forum). Overall the posts I found didn't help my understanding.
I am sorry if I overlooked something more. Maybe you could give me a hint for explanation. Thanks in advance.

Kind regards,
Juliana