Well, soontobe, you obviously haven't read the relevant bit in the link I gave you, very much like most of the newspaper columnists.
This is it.
"There are electors for whom immigration is already a very high salience issue, who already plan to vote Ukip. For these electors, the issue needs to be addressed: there is no longer a risk of making it worse with that group. As always, it is preferable to first of all establish a relationship with such voters before discussing policy in detail. However this may not always be possible or desirable. Our advice is therefore that we should:
(a) listen carefully to electors' concerns on immigration on the doorstep and engage with their views before moving the conversation on to how Labour would tackle the issues they have raised (whether they be housing, education, the NHS, etc.). We should acknowledge electors’ concerns and contextualise the problem as something that Labour has a clear plan to improve."
He says that they should engage with the elector's concerns on immigration and engage with their views, before then talking about other issues with them. If the voter is going to vote Ukip, it cannot be made worse by discussing Labour party policy with them.
Nowhere does it say do not discuss immigration with them.