Without standardization, it's rather difficult to determine what "Minimum Requirements" actually mean. Minimum and Recommended system requirements vary wildly in terms of their accuracy. I highly doubt that someone with, say, a Ryzen 5 1600 is going to have a straight up bad experience with the game despite being below the minimum requirements. For example, Resident Evil Village has a minimum CPU requirement of a Ryzen 3 1200/ Intel i5 7500, but I guarantee you can get a good experience out of a weaker CPU (especially considering Intel's stagnation with 14nm, there isn't a massive difference between a lot of the generations of Intel CPUs).
All that being said, while I think you will likely be able to get a perfectly fine experience with a lesser CPU, it is worth considering that the 2600 is over 4 years old at this point and we're in a period of significant advances in the CPU space. Because of Intel's stagnation, tons of PC gamers coasted for years on (for example) 3rd gen and 4th gen Intel CPUs with basically zero issues. But in the 5 or so years since 1st gen Ryzen there have been massive gains in CPU power. The difference between the Ryzen 5 1600 and the 5600 is absolutely massive. So it wouldn't surprise me to see the 2600 start to struggle a decent amount in modern AAA titles, especially with true next-gen games starting to drop shortly.
All that being said, while I think you will likely be able to get a perfectly fine experience with a lesser CPU, it is worth considering that the 2600 is over 4 years old at this point and we're in a period of significant advances in the CPU space. Because of Intel's stagnation, tons of PC gamers coasted for years on (for example) 3rd gen and 4th gen Intel CPUs with basically zero issues. But in the 5 or so years since 1st gen Ryzen there have been massive gains in CPU power. The difference between the Ryzen 5 1600 and the 5600 is absolutely massive. So it wouldn't surprise me to see the 2600 start to struggle a decent amount in modern AAA titles, especially with true next-gen games starting to drop shortly.