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"All general-purpose programming languages can solve the same problem."

That's not really true, in general. They can all compute the same things. Some problems have constraints beyond "what is computed".

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I don't get it. What do you mean?

Performance reasons

That's much of it. Another reason might be "no one has written a XYZ interpreter for the target architecture", which may be due to performance or just obscurity. Another problem constraint might be pedagogical - if the problem you are trying to solve is "show how to do X in language Y" then of course language Z can't be used - though that example could reasonably be dismissed as trivially true. I'm sure we can come up with some more if we try.

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