That's because the so-called "fixed election date" leglisation only circumvents the 5-year limit laid out in the consitution. The federal and provincial Crown representatives retain the ability to call a general election - I don't think that can be changed without an amendment to the constitution, which ain't gonna happen.
It's always been smoke and mirrors.
Nah, the PD also prevents Starfleet from, say, rigging a Romulan election.