Broader question is does this Trumpian style of diplomacy, where you try to embarass and humiliate actually benefit Saudi in the long run? Absolutley not IMO. The benefits of their engagements in Canada are self-evident ( trained their doctors, engineers, teachers) , a good source of agricultural products they demand ( wheat) and decent place to invest.
What do they get out of this debacle? At best, they make a political point that a) none of their Western partners are willing to risk their investments to drive hard for HR and b) HR critcism could risk investment. But it doesnt really help their bottom line and economically their problems are self evident :
A Target Saudis Can Ill Afford to Miss. And It's Not Aramco IPO
But thats probably the point. Has little to do with the interests of the Saudi pop at large, but about bolstering MBS image at home. It will help this muscular new jingostic style of nationalism that MBS seems to be building. The image of getting a Western country to fall back will bolster the idea hes made them a more powerful actor in the eye of his citizens.