better be sure of that, some not most.
Firstly, no general statement issued by a manufacturer is likely to apply to every single product that they make. This applies to motorcycle tire manufacturers as well.
Secondly, I have no idea whether the number of motorcycle tire manufacturers, or the number of tire models that they make, which do not use release agent is the majority of them, the minority of them, or somewhere in between.
I do know that it doesn't matter a tinkers damn what I am or am not sure of, because it is not me making this claim. This is what several of the major motorcycle tire manufacturers have written themselves about the tires that they produce.
Among their comments, Bridgestone specifically wrote;
The release agent is something that is in the actual mold and is used to allow the removal of the tyre from the mold itself.
The higher the quality of the mold, the less release agent is required. Some tyre manufacturers’ tyres do have a release agent in them. Bridgestone, however, use very high quality molds so our tyres do not have a release agent in them at all.
I am just contributing what I have learned on the subject. Anyone reading this is free to do as they wish.