Weak amenability and C*-exactness for infinitely presented small cancellation groups

Let $G$ be a finitely generated group defined by an infinite presentation satisfying the small cancellation condition $C'(1/10)$. Weak amenability and $C^*$-exactness (equivalently, Guoliang Yu's property A) should hold for $G$. Small cancellation approximation conjecture. Every such group $G$ is weakly amenable and $C^*$-exact. This would extend the known Metric Approximation Property for the reduced $C^*$-algebra and Fourier algebra of these groups to stronger approximation properties; the source postpones further considerations to future work.