The poll did not go into detail. What it sought to measure was the interest electors had in some form of proportionality. They did not ask about the preferred system. On this, may I refer you to some research which also took place only in Quebec during the 2012 election. This inquiry, entitled Vote au pluriel, was carried out by Marc-André Bodet. In the course of that research, there were simulations of the electorate in real time during the election, with different voting systems. The results obtained were very, very different.
For instance, in 2012, with the preferential vote, the Coalition Avenir Québec would have formed the government.