I wouldn't say suddenly changing his tune. He's taking good advice it would seem, as under the current circumstances a GE on Boris's terms would most probably see him defeated.
A lot of talk in here about strategies. What should and shouldn't have been done from the start.
It's all party and self preservation, but what's good for the goose is good for the gander. Why should he walk blindly into whatever trap was so clearly orchestrated by Cummings.
I'm not saying Corbyn is the answer to your prayers. Far from it, but why would you expect dirty tactics and subterfuge to be met with anything other than the same.
The reality is holding an election on this one issue seems daft to me. But it's all every party has been consumed with for the last three years.
It has to be sorted one way or the other. A lot at stake before you can carry on actually running the country.