Is this a logical contradiction?

This is a semantic matter, as it depends on the definition of the concepts: 1. What does ‘concept’ mean? 2. What does ‘unconceivable’ mean? By the first question I mean the decision of whether the understanding that something is unattainable is itself an achievement of it or not. It is a matter of definition. By the second question, I mean the discussion of whether when you achieve a certain aspect of something it ceases to be unattainable, or whether it is unattainable from the other aspects. Again, a matter of definition. If you assume that such an error is an error and answer that unattainable means from all aspects, then it is clear that it is impossible to say about something that it is unattainable. If the understanding that it is unattainable is itself not its attainment, then of course there is no problem. And if this understanding is an achievement but ‘unachievable’ refers to its other aspects, again there is no problem.