Did not insinuate wanderers. Would like to know, though, when they first re-appeared.
Didn't say you did. I expect there has always been an occasional presence of Labrador wolves, at least since the extirpation of the Newfoundland wolf in the 1920s. For the most part I think these 'visits' have previously been largely limited to the Northern Peninsula. Factors since then:
(1) the opening up of access routes on the GNP and elsewhere, e.g. snowmobile trails, power transmission lines (such as the Muskrat Falls work), have allowed natural wanderer predators (like coyotes and wolves) to more quickly spread across the island than before; and
(2) many more people have the ability to access previously isolated areas of wilderness, because of snowmobiles, ATVs, etc; and
(3) virtually everyone has quick and ready access to a camera and media.
Hard to say if there are more Labrador wolves on the island than before. I lean towards yes, mainly because they are being seen more often in southern Labrador (suggesting more likelihood of making the crossing) and because of #1 above. I still think there is some ways to go before a regular established presence, if ever.
Official dates for first coyote was 1987 (Deer Lake). locals in Gros Morne area have spotted coyotes there years before.
It is likely even earlier than that. There was some evidence found in southwestern Newfoundland as early as the late 1970s during some caribou research work that was going on there at the time, but it wasn't documented.