That’s only from one talent. Baseline, wind walk heals 3% PER second for 10 second. Granted, you don’t always use wind walk till duration, but that’s potentially 30% healing that can be used every 15 seconds, which is insane. There’s nothing in the game that even comes close to that kind of self healing. To put that into perspective, that’s better healing than a Garrosh at almost no health spamming blood thirst on heroes.
Samuro’s ability to survive should be marked by his slipperiness, mobility, and “tankiness” from his images. Once you add in ridiculous self sustain on top of that, it becomes an absolute pain to deal with.