I disagree it objectively a bad stoppage. If you had to rewatch, slow to 0.25x speed to even come up with a little bit of evidence it was in the in range the ref could stop it. Stopping is a subjective call, he may well have seen what you saw but the balance of the other things he observed outweighed that.
It was clear to everyone Izzy was hanging on by thread and at that point you can expect a ref stoppage at any moment. It was up to Izzy to show something and he didn't do enough to convince the ref.
Could he have survived longer? Perhaps. But that isn't why a ref stops it. They are protecting the fighter and stopping beatdowns. If it wasn't ended when it was the most likely outcome by far was his lights being turned off.