Been a while for me but afaik nothing has changed: if you lived and worked here before, then a couple of your last salary statements are sufficient (bar the problem of actually finding anything and being accepted, but that is besides the point).
So I am definitely not loving or defending this, but afaik compared to needing years of time to build your credit score in a "smart" way (and by hearsay I would probably mess it up, "just be employed for 3 months" sounds very easy to do?