No.
Did Shane state this in court or was it made up afterwards via podcasts and other untrustworthy sources?
Shane didn't really state anything about the conversation he had when he came down stairs, that's the point, Ken! He couldn't recall anything out of the ordinary that day, he certainly didn't recall a conversation with his mum about the absence of Luke and no supper being ready, did he?
People claim that Shane finally told the truth in court, well the truth must be that he didn't take any notice if Luke was in the house when he came down stairs at 5.15 and only realized something out of the ordinary had happened when Corinne phoned from the police station later that night.
If LM was not in the house at 5.15 when Shane came down stairs it follows that there would have been a discussion about him being absent and no supper laid out ready surely?
And Corinne would have asked Shane if he had seen Luke when he got home etc,. Its just common sense, Ken!
Hence we can conclude that Shane got something to eat that evening as usual, and therefore Luke had been present in the house to make it.
Does that make sense, Ken? Or what do you suppose occurred between Shane and Corinne at 5.15?