If it were a crater, it would be pretty much level with the rest of the terrain. You don't suppose it was impact created with a subsequent volcanic upsurge due to penetration into a magma dome?
Its unusual to see an impact event that would have had to have been at 90 degrees to the surface plane.
If it was soft material as in a crater wall, it would have been glaciated flat, like the rest of the terrain around it.
This is a mysterious formation. I do not believe it is a crater. Its a collapsed cauldera, which has been glaciated. The circumference shows signs of having been rounded on its edges by glaciation, as the ice moved around and over it.It it were soft crater wall material, instead of volcanic rock, it would have been buldozed flatter than a pancake.
I wonder if much geology has been done on the rock matrix surrounding this lake? I doubt it.
It is a strange lookng formation. If there were a mile of ice and the asteroid went through that before hitting dry land what would the result look like and what about when the glacier eventually melted and left along with the regolith? It might look like that.