Lordosis is mobile and the deformity
We define lordosis as the concavity of the curve of the back, so we have two lordosis, cervical and lumbar. When we talk about hiperlordosis we mean increased lumbar arch.
When the hiperlordosis is due to muscle rigidity, it is not enough to stretch those muscles analytically because the tension will be broadcast to another part of the body: neck, legs, thorax, etc. Any attempt to reduce his neck hiperlosdosis automatically lead to an increase in their lumbar lordosis and vice versa. It is as if lordosis is moved from one side to the other. Hence the importance of relaxing those muscles while other parts of the body to avoid related compensation and deformities are controlled.