I wasn't aware of that. I don't know whether Matthew was aware of it.
However, the McCanns had dinner at the Millennium, plus breakfast the next day, before they settled on Baptista for breakfast and Tapas for dinner. It is a presumption, but that suggests 3 times by the short route versus 1 by a longer route.
Matthew does not state which route he took, merely that he went to the Millennium. It is my assumption that he headed east, given that by then Matthew should have worked out the short route. And if he did, he was on the Tannerman route, though he does not appear to have had Tannerman on his mind.
IMO the missing child never went to Millenium for breakfast, and the only time she went there was Sat evening for dinner, when they walked there via the direct road route, however they got lost on the way back:
"About an hour later they finished dinner, and returned, equally walking, by the same route, though going wrong in one of the streets where they should have turned left, ending up only turning only at the next street." (GM statement 10 May).
The only way to interpret that is - when they were walking home along Rua Ramalhete they missed the left onto Rua Silva and so took the next left onto Rua 1 Maio and then left onto other end of Rua Silva.
Yes MO in the early search took the direct road route to Millenium, however IMO if the child wandered towards Millenium she would probably have retraced backwards the longer "got lost" route.