Yes. All of our choices are involuntary but we tend to assume they are voluntary.
Presumably I can still say “Well, I wasn’t under the influence of mind-altering drugs, and I wasn’t suffering symptoms of mental illness, and no-one used any threat of coercion to try to get me to do what I didn’t want to do”.
That might all be true but there are factors you are not aware of. Neither you nor I nor anyone else can say we are not under the influence of factors we don’t know about. You may know you are not inder the influence of mind-altering drugs or suffering from any mental illnesses you know about, but how can you know what you don’t know? For example, how can you be sure you aren’t breathing in some unidentified and undetected gas you don’t know is present that is affecting your decisions? Or how can you know that you are not suffering from some mental condition that has not yet been identified but which is affecting your decisions? Those are just two things you may not know about. What of the thousands (or millions) of other factors you have no knowledge of but which are affecting your decisions?