So basically the gist is that the Norse reached southern Nova Scotia?
That's not a very wild claim, definitely within the realm of possibility. One of the writers in my
Smithsonian book on the North Atlantic Norse makes similar claims, but he pointed to New Brunswick as the probable location of the Norse interaction with Native Americans. If claims like this are true, then the encampment in Newfoundland was indeed a base camp from which further exploring was done, which would explain the presence of nuts at the archaeological site that are normally found much further south.
I wouldn't take your website's word at gospel truth though. I don't know enough Eastern Canadian geology/geography to determine exactly how accurate its claims about where the Vikings explored are. Like I said it's within the realm of possibility and an interesting inspiration to explore when writing about Vinland.