Why? Does recognition entail that every worker is compelled to join the union?
Also on the communication by wales he says he wasn’t happy with the election because people knew who voted for, but he didn’t deny there was some kinda of election?
Misinformation.
Voluntary recognition just means that there isn't a 120 hard fight against union elections to decide if there CAN BE a union.
Dark Horse comics just voluntarily acknowledged their union. After that is union elections, to decide who the union elected is.
The choice to voluntarily recognize the union would remove an obstacle for its creation. Deciding not to, in that context, can be seen as choosing to leave the obstacle in place. That, in turn, can be seen as intended to prevent the union from forming. The union is primarily a means of increasing bargaining power for its members. Therefore, this decision by WMF can be seen as intentionally weakening their employees' bargaining power.