I think we need to clarify the poll numbers here. This is according to Toronto Star on the figures.
When asked to pick between Subways and Light Rail:
55% favor Subway
40% favor Light Rail
When asked between Subways only, Grade Separated Light Rail, and Transit City Light Rail:
~50% favor grade separated Light Rail
32% favor the original Transit City Light Rail
15% favor Subways only
So the findings from this poll show the majority of Torontonians don't necessarily care what vehicles (subway or light rail vehicles) are being used as long as it is grade separated rapid transit - that's not the vision that Transit City outlines.
So yeah, basically the fact that it's in a tunnel matters more than what will be driving through the tunnel. This poll is good news for the trunk portion of Eglinton, but it's bad news for pretty much every other part of Transit City. I wonder if this study will cause even more of a push to make Eglinton East grade-separated, and connect it with the SLRT.
In any case, it's quite clear from this poll that the majority of people do not want in-median LRT.