There was no line visible as far as that shown pavement stretched. But after a few yards the pavement turns into a dropped kerb entryway for a building, next to which part of the yellow line is visible. There's no indication that yellow line stretches past that dropped kerb all the way to the pavement in question.
See video.
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Also curious if the yellow line thing is a red herring altogether? Since the contravention is to do with the bay marking, I wonder what the Brent TMO regarding bays is.
This example from Bromley gets off due to peculiar wording in the TMO requiring the bay itself to have a parking meter next to it, not sure if that's the case for Brent too.