If the purpose of the Scotland Matters billboard was to convey information then we would have ample justification for saying it had failed. But conveying information is no part of its purpose.
I have long suspected that many of those participating in the 21 polls (so far) indicating a lead for Yes are responding to unasked questions about Brexit and handling of the public health emergency. They are not answering a question about Scotland's constitutional status. Although even they might think they are.
Where I take issue with Shona Craven is, not in her vindication of newspapers, but when this appears to shade into a generalised defence of journalists.
Once we accept that we need a strong leader, we can then be persuaded that it defeats the purpose to have people questioning his judgement and impeding his efforts to deal with whatever crisis it is that has persuaded us of the need for a strong leader.