Generally “strong AI” means general intelligence, such as a human’s ability to figure out the solution to problems in general, as opposed to the single-purpose

Generally “strong AI” means general intelligence, such as a human’s ability to figure out the solution to problems in general, as opposed to the single-purpose AI tools that we have today. So solving Linear A (by a method like this one) wouldn’t be “Strong AI”- merely profoundly powerful “weak AI.” (“Strong AI” is also sometimes used to refer to conscious AI, but that’s a different issue again.)