A good break down of the other polls done by Yougov on this subject by youtuber Phil Moorhouse.
My personal opinion is that Labour do not want to talk about Brexit until they can stop the Tory media telling lies on the subject. We will only get one shot at reversing this fiasco, so they want to get it right. With Labour I agree on this. Let it lie until we can have some actual facts on the matter. Any discussions with current media throwing in their bias is swayed by those who have pocketed billions from the Misery imposed over Brexit.
And I hope it is a massive defeat that takes them decades to recover.
However I have seen polling in the past election where May was going to get destroyed, where Brexit was unlikely, where Corbyn was going to be PM. A poll is just a poll.
Until we get the real numbers through I’m not going to hold my breath. This country has shown time and time again that we are great at picking the really stupid option.