Richard contacted his alliance members about the task that Skull had posted. He had already approved and posted the task so it was already in the task interface in the task room.
Richard was confident that there would be a lot of participants in the extermination of the Luo Clan aside from his alliance members. Even if some of the members of Real Delusion didn't have any grudge against the Luo Clan, it didn't mean that they wouldn't participate in such a task with a lucrative reward.
After all, there were always those members of Real Delusion that was lawless and heinous. They were members of a criminal organization so they didn't care whether their actions were good or bad as long as they granted them a lot of benefits.
That applied to the task that Skull posted since even if they were well aware that there were innocents in the Luo Clan, they wouldn't care about it. In the end, they only care about the benefits of their actions instead of morals and reputation.