Changing the CPU without also needing a new fitting motherboard is not really possible in most cases. (The AM4 socket was a lucky exception…)
Your best bet would be trying to find an used Intel Core i9-9900KF for cheap. But they are still at 200-300€.
If course its made up… Even if you don’t hear it, you can still smell it and know that it’s not something appropriate to do at a restaurant or when there are people around.