Yeah it is undeserved but at the same time it's funny Ryu would get slaughtered by Snuka prior to his operation and even now I feel he might struggle against him. I hope the author won't make Snuka weak suddenly only to job against Ryu would be lame but seems it's heading that way.
Either the author made an error, or the translation is missing on some subtle language as the heart does not produce blood, it only acts as the main pump to send it through the body's blood vessels.