Not even close to right. First of all, the "small generic math problems" given at IMO are designed to challenge the strongest students in the world, and second, the recent results have been based on zero-shot prompts. The human operator did nothing but type in the questions and hit Enter.

If you do not understand the core concepts very well, by any rational definition of "understand," then you will not succeed at competitions like IMO. A calculator alone won't help you with math at this level, any more than a scalpel by itself would help you succeed at brain surgery.