No they are not, they're demolished. That's the site of the 6 Dawes Apartments by Fitzrovia, now under way.
However, there is no tunnel incorporated into the design for that site, so far as I'm aware.
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I think a tunnel at the stage of various proposals is a serious challenge and questionable use of funds, for reasons discussed in multiple other threads.
But we can certainly address icy conditions by having a snowmelt system put under the sidewalk/path between the two stations, in relative terms, that's cheap.
In the medium term, there is a need to remove that really good Shwarma place at the corner to create a more reasonable capacity and streetscaped sidewalk between Danforth and Main Station.
If we can just get, decent width, decent lighting, decent wind mitigation and snowmelt, then I think we've made that connection a lot more pleasant; all for a fraction of the cost of a tunnel.