The person that wrote that overview you linked is one of the first people that brought the vaulted skull issue to my attention. https://www.facebook.com/notes/swed...ndrace-vs-selective-breeding/210460850844378/The OP in this thread suggests not. Repeating it does not make it true. And specifically as a landrace breed, what 'breeders' of your acquaintance think or do to interfere in their reproduction is, frankly, irrelevant.
The OP @thatakfarmgirl might find this page useful for some supported information,
https://naturalchickenkeeping.blogspot.com/2013/09/breed-overview-skansk-blommehons.html