No, it was not a tap. In fact, it doesn't even look like he touched GSP, which would be why GSP kept going like nothing happened.
1. Choke was not tight.
2. Choke was being released and most most of the taps were AFTER being released. Who continues to tap after a fighter releases a hold???
3. GSP didn't say sh*t.
4. Ref didn't stop fight.
5. Questionable if the taps were even hitting GSP's leg.
Here is what is happening. Hendricks is moving his arm to try to sweep. His elbow gets caught on GSP's thigh. This leads to an unstable situation, his elbow on soft flesh. His arm flutters in an apparent "tapping" move. #6 could have been Goldie and Rogan didn't say sh*t, either, but as everyone knows, they're not really reliable sources.
Thank you.