At what point in the post did it say "Tory voter"? I suppose if you vote Tory you could class yourself as a Tory if you vote for them but IMO that's a bit weird, treating politics like a football team and being wedded to it regardless of what the party says or does.
To me, it read as a criticism of the government and not "half the population".
Also, only 27% of the population voted Tory at the last election so it's very, very far from half of the population.