No it's not it's based on the statements and evidence like moving doors and abnormal behaviour. The best time to do it once it turned dark was when they were all present at the table ordering from the menu i.e. around 9pm. Matt had just checked so there was no need for another straight after. If found in bushes close to the crime scene time since death could be established and that could incriminate so a second move was needed further away to a good hiding place and it worked because she wasn't found. And Peggy you would never leave a bag with a body in bushes that could incriminate yourself.
How can you possibly differentiate between normal and abnormal behaviour? All you know of these people is as a result of a highly abnormal occurrence which was life changing for all concerned.
Mr Amaral's hypothesis involves "accidental death".
Why on earth would the reaction to finding a dead child be to immediately plot to hide her little body in a place where they were strangers and didn't know of 'a good hiding place'.
Nor unfortunately for the hypothesis did they have a local contact willing to collude in storing a child's body in a freezer for an indeterminate period.
How the perpetrator of the crime against Madeleine must have been laughing himself silly at all the shenanigans desperately being conducted to implicate her parents and giving him an eight year breathing space ... and if he had been lucky enough a lifetime's get out of jail free card.
Bet there are people in Portugal feeling a bit hot under the collar now that the spotlight has been swung in the appropriate direction at long last.