I don’t know about being straightforward, but it certainly was unclear 
There just wasn’t enough room in the intro to explain it fully. On the inner pages, we detail the update to the DCF model parameters (lower debt, lower required rate of return), which was part of the reason, and secondly, regarding the peer multiple/discounting method mentioned on the front page, we naturally updated the latest figures and changed the “target year” to 2029.
A bit technical, but I wanted to highlight them in the intro somehow, as forecast changes alone would not have justified such a large increase in the target price.