Is Ryzen a good cpu choice for RPCS3?

Yes, it's detailed. It recommends a Quad-Core or up from Haswell+ gens.

If you have any of those i7 CPUs you're good - except for the ones you stated that don't even exist, like 6770K and 5770K.
But I'd specially recommend 6th gen or up for TSX Support. AVX2 support is also introduced in Haswell CPUs.

The ultimate recommendation is 8700K though, as it's the ideal CPU for RPCS3 as is.

OK I have confused it with i7 6700K

I have 7700K