This is not true at all. A pedophile is someone who is attracted to prepubescent children (13 or younger), it has nothing to do with the age of consent (18). Someone who is attracted to a person who is younger than 18, but past puberty is perfectly normal. The only reason age of consent even exists is because people who are younger are generally not able to understand or deal with the consequences of having sex or doing sex work. It's a completely arbitrary age, and is actually lower in some other countries. A person doesn't suddenly become attractive the minute they turn 18 just because the law says you can legally have sex with them.
While you are right that pedophiles are interested in a developmental stage, there's more to it than that. There are actually terms for people who are sexually attracted to people in early puberty and later adolescence, the former is called hebephilia and the latter is called ephebephilia. Also, it should be recognized that some pedophiles are non exclusionary pedophiles who still can be attracted to adults.
Besides, if we are talking about a model who LOOKS to be at that person's preferred stage of development, and they genuinely believe that the model is a child, isn't Iris right that it is pedophilic?