The link is a couple of comments up this chain. Interestingly your link, which I think is part of the same survey series breaks it down into EU and non-EU immi

The link is a couple of comments up this chain. Interestingly your link, which I think is part of the same survey series breaks it down into EU and non-EU immigration, and the latter has about a 10-30 point worse score, which can probably explain the scores for generic immigration getting worse immediately after the EU immigration got curtailed. And again, it's the Old/Conservative/Brexit voters who are on the "angrier about non-EU immigration" end of that range. They just keep shooting themselves in the foot.