OK the Moyes' walked past on the Thursday but the headline says "Mystery couple seen going into McCanns’ flat on night before sobbing Madeleine disappeared" That is pretty hard to work that out but I take that to mean the night before Madeleine disappeared so the interview with Mrs Moyes does not really describe that IMO.
Your newspaper story says;
''The tip-off was given by two key witnesses who were reinterviewed as part of the Yard’s two-year, £4.5million investigation.''
It doesn't say who these witnesses were, but a lot of the article is clearly referring to the Moyes;
''We can confirm that a couple staying in the same block as apartment 5a were interviewed last February......They had been at a restaurant earlier in the evening and left at about 9pm''
The article could be read as inferring that these were the 'two key witnesses' but that's highly unlikely as the Moyes saw nothing on either night, as they have said.