They mean, a referendum in a Tory government, but no referendum in a Labour government.
DO NOT VOTE LABOUR
Which means we've already won.
"God dammit, will you stop doing this. HOW have we already won?"
Labour = Labour Brexit
Brexit Party = Full fat Brexit
Lib Dem = Referendum + remain
SNP = Referendum or independence
Can you see what's missing? Of course you can. What about the Tories?
If there's an election the Tories have to present a manifesto. And whatever they choose, referendum, no referendum, Brexit or remain, they're going to lose half their votes.
If the Tories choose remain, they lose a chunk of their votes to the Brexit party.
And in either case the Tories lose seats. And if they lose even 1 seat Labour will form the next government.
"How scared?"
Scared enough to make sure they don't lose that election.
Not because you wanted one, but because it's the only way to save their own skin.