"a person familiar" --that's the source?
The rest of that Politico article discounts the Feb 16th date saying "as soon as the 16th" implying the 16th might be the earliest that Russia will be ready. And says "It's possible the Feb. 16 piece of intelligence is raw and not the overall assessment of the United States".
I think that's what Steve Lookner was saying. Biden never said it would happen on the 16th, at least not publicly. Unnamed "sources" or "a person familiar" might have heard it, but we don't really know.
And since it contrasts with Biden's and his administration's public comments, the public comments are to be believed, not "a person familiar".
Biden has plenty of incompetency to account for without having to defend "intel" that they didn't publish and that contrasts with their public statements.