Why no official correction of Douglas Ross’s blatant lie?

Source::
The National
Why no official correction of Douglas Ross’s blatant lie?

I AM mystified as to why the SNP … or SOMEONE … doesn’t put out an official statement about this “once in a lifetime pledge” which never happened. Douglas Ross is now saying “Nicola Sturgeon signed a pledge” which we know is a lie, he surely knows is a lie, and anyone who is even half-awake in Scottish politics knows is a lie. And yet there has been no official statement even now.

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The National
Why no official correction of Douglas Ross’s blatant lie?