You obviously opened a project with STM32CubeIDE that was created with TouchGFX, right?
You have to know that the TouchGFX part is based on C++, while the backend works with C, for which the IOC file is responsible. In this respect, the information is completely correct, because you are currently in STM32CubeMX being a part of STM32Cube.
Does it answer your question?
Regards
/Peter
In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.