Level-two congruence subgroup conjecture for non-spherical small Coxeter groups

Let $\Gamma$ be a non-spherical small Coxeter graph, with associated Artin group $A[\Gamma]$, Coxeter group $W[\Gamma]$, and level-two congruence subgroup $A[\Gamma][2]$. Write $W[\Gamma][2]$ for the level-two congruence subgroup of $W[\Gamma]$. Level-two congruence subgroup conjecture.

$$A[\Gamma][2]=\ker\bigl(A[\Gamma]\to W[\Gamma]/W[\Gamma][2]\bigr).$$

The preceding argument establishes the inclusion of the right-hand kernel in $A[\Gamma][2]$; the conjecture asserts equality for every non-spherical small Coxeter graph. The parser provides no evidence of a resolution, so the conjecture remains open.