Yes. In a deterministic universe, a person could still change if something is pointed out or they experience something. Yes, they might not. But they might. When encountering something someone says, he will respond that he may be, for all we know, compelled. But without acknowledging that he is compelled, it seems, in such a way that nothing can effect him. This despite the dasein thing, which he bemoans because it means he might have his mind changed at any time.
I have seen this pattern a few times:
Phyllo or someone: Well, Iamb, you might be wrong because of X.
Iamb: perhaps I have been compelled to have the position I have.
Phyllo: OK, but now I have pointed out X.
Iamb: for all we know I have been compelled to only believe Y.
IOW the step where Iamb interacts with your presenting of X is skipped over as if determinism means, precisely as you say, ‘I am not able to change.’
When in fact these are two different things, as his repeated stories about how dasein affected him indicate. But in practice he is not malleable if determinism is the case (in his mind).
But that is not a consequence of determinism.
Now, of course, X might only change some minds. He might retain his belief in Y despite having chewed on X.
But he presents it as if minds cannot be affected as a rule.
And this is confused.
But I notice how this is a part of his metaphorically throwing up his arms and saying ‘How can we…’ know, change, understand, decide, find (for example what could be called more authentic in the self).
It is ever increasing the throwing up the hands gesture in his posts.
Which would be great if he said ‘I give up.’
But that would eliminate the process.