Its coming from the JS. I update the JS code and it works for me:

/** @odoo-module **/
import { UserMenu } from "@web/webclient/user_menu/user_menu";
import { patch } from "@web/core/utils/patch";
import { registry } from "@web/core/registry";
const userMenuRegistry = registry.category("user_menuitems");

patch(UserMenu.prototype, "your_odoo_module.UserMenu", {
    setup() {
        this._super.apply(this, arguments);
	​	​userMenuRegistry.remove("documentation");
	​	​userMenuRegistry.remove("support");
	​	​userMenuRegistry.remove("odoo_account");
    },
}); 

Here in this code removing odoo_account from registry ultimately removes the odoo_account menu.  

Note: Don't forget to replace "your_odoo_module" with the actual technical name of your module!