Did Raffaele actually say that he looked at the toilet or was he quoting what Amanda said to him? This second interpretation is supported by the testimony of Monica Napoleoni as recorded in Massei and elsewhere
Raffaele's diary:
"We look around [facciamo un giro] the house and Amanda is terrified and jumps on me because she tells me that the faeces were no longer in the toilet since presumably before, when she was taking a shower, she had seen that there were faeces in the bathroom and nobody had flushed the toilet. I have a look and leaning over I see the reflection of the water and, not seeing any faeces, I believe what Amanda had told [diceva] me."
No way that someone who had ever had a look at that toilet would speak about the "reflection of the water and not seeing any faeces".
I don't see how this is not a lie.
He clearly has never seen it.