Honestly, I'd be very surprised if AI could even solve those problems.

The only AI I've heard of that might eventually be able to actually solve problems is OpenAI's Project Q, and that one isn't public yet. The publicly available AI tools can just repeat things they have already seen online (with a rather large chance of repeating it wrong due to their lossy nature). So, unless the riddles exist somewhere online in a reasonably similar form, I'd expect the chatbots to fail at solving them.

(They can, however, help a human developer solve them quicker than the developer could without AI assistence.)