This person doesn’t know what they’re talking about, or is withholding information. Yes, your photos have been used to train early iterations of the stable diffusion models. Those iterations are hardly usable in most applications, and will be phased out in A few weeks.
If Spawning is able to have your images removed from the training set by version 1.7 or whatever, you will be removed from any models actually in use for real commercial applications.
We (Spawning) did not create the dataset or train the models in question. We're working to make it easy for people to remove themselves from, or add themselves to, this dataset and future models.