The Torngat Mountains appear to have retained snowcover through summer but satellite is spotty and cloudy as of late. It does not get picked up on the low-res map you quoted.
Dear BBR,
I really love your hypothesis about a reglaciation in Northern Labrador and Quebec.
I have always been fascinated with snow and ice, glaciers and permafrost.
It was a great disappointment to me when as a teenager in the '70s that I discovered that, no, the planet is not cooling off after all and I would not be able to witness glaciers reforming in Scotland (I was born in the UK).
I moved to a nice cold place as soon as I could, and have been mostly satisfied with the prevalence of snow and ice, glaciers and permafrost here in the Yukon.
There is a mountain range near me that was glaciated until the Holocene.
It was surrounded by ice free Beringia, so acted as a sort of refugium during the ice ages.
The glaciers are gone, but snow persisted through the summer and some ice patches are quite old.
This summer, for the first time in living memory, all the snow and ice melted.
No more glaciers on the horizon here.
So, while I rather doubt the feedbacks you detail will result in the regrowth of an ice sheet, be assured that I really, really hope I am wrong and you are right.