That's tracking how well they're following some of their promises (which is interesting, and in many ways good - thanks for the link).

The issue is more the seemingly random introduction of a bunch of right-wing crap that nobody who voted for them asked for, that wasn't in their manifesto - they are "throwing it out the window" by saying "sod our election promises, let's do this other shit instead".

If they can randomly add non-manifesto crap that nobody wants, then there should be no issue if Burnham wanted to introduce something that wasn't on the manifesto.