The context of DW telling the police about supposedly leaving a side door open is to explain why he told them he thought Danielle may have gotten into his house. The excerpt I posted last night is just a snippet of what he said.
I think I see where you got this.
DW said when he came walking toward home and the neighbor told him what was going on about Danielle, that he headed to his house to see if maybe she got into his backyard and had fallen into the pool.
When asked by police later, he said when he got to the house, he found the garage side door open. (Just like the Van Dam's was found open).
I think you are making up the rest. I don't recall him trying to tell police That is how Danielle got in his house. He only thought she might have gotten into his backyard. If you can show otherwise, I sure would like to see that.