Is This Proof That Amanda Knox Lied About Her Alibi?

An Italian TV show recently broadcast CCTV footage which they claim shows Amanda Knox walking through a car park in Perugia in her old neighborhood the night of Meredith Kercher’s death.
The footage which surfaced on Quarto Grado is timestamped at 20:53, which would prove that Amanda Knox was not at boyfriend Rafaelle Sollecito’s the whole evening, as she claimed.
The investigative reporting show claims that the clothes worn and the walk of the woman is similar to that of Amanda Knox.
According to Barbie Latza Nadeau, author of Angel Face: Sex, Murder and the Inside Story of Amanda Knox, both the prosecution and the defense were aware of the footage but neither side found it useful.