That may be true, but in this case it doesn't even involve that. "The voters" got no say in Truss becoming PM, or in the wild tax-cuts she immediately implemented. Because there hasn't been a general election.
She was foisted on everyone by the anonymous Tory membership (which includes non-UK citizens and non-residents, and could even, in theory, include entirely non-existent people, potentially invented by foreign lobbyists prepared to pay the membership fees of such fictional characters).
Even Tory MPs didn't really want her as PM (which is why some of them are apparently already sending in letters of 'no confidence' to the 1922 committee...unfortunately it will take a very long time for enough such letters to accumulate to trigger a no-confidence vote and yet another change of leader).
I personally doubt that the Northern 'new Tories' of the former Red Wall would have voted for her and her policies, if given the chance. They voted for 'good bloke' Johnson and his promises of "levelling up", but it turned out to be a bait-and-switch and now we are stuck with Truss.