Are Sunak and The Telegraph right, and will a Labour government be something to fear?
My presumption from this statement is that you are trying to spark up a debate about the downsides of an incoming Labour government, rather than you declaring that you've fallen for the obvious marketing tactics of playing 'evil music' and making things up in a political advertisement.
Just in case it's the latter:
This ad was put forward by the Conservatives in 1978, when the unemployment rate was approaching 6%.
The Conservatives won a year later in 1979, and unemployment doubled, peaking at a staggering
11.9% in 1984, 5 years into a Tory government.
This ad featured during the 1997 campaign, as the Conservatives tried to convey the message of Satanic forces behind Tony Blair.

Tony Blair ending up being a 'One Nation' Tory, and loved nothing more than winning elections and invading other countries with his mate Bush. However, reliable sources have confirmed that he does not lay on beds of Brimstone, and he has no numbers imprinted on the back of his head.
Talking of Blair, this cheesy ad indicated that, not only did Blair not know who to vote for in 97 (evident in how indecisive he is with the polling paper in his hand), but that he also wore beige chinos.
From: https://youtu.be/gi5j7jjhm4M?si=xnQczkJhvAJ_lloM
I never saw him in beige chinos after that.
There's this rather excellent Green party ad from 2015:
From: https://youtu.be/PPgS7p40ERg?si=7RriZh5M2KIHcWyL
As far as I'm aware, David Cameron, Nick Clegg, Ed Milliband, and Nigel Farage have never officially created a boy band together.
So I doubt very much that you'll wake up on Friday with Evil Music permeating around your bedroom, no electricity, and having to cancel your Portadventura trip.