As people have said, this looks like feedforward. Regarding stability, that is the purposes of the feedforward stage.
You have two OTAs in parallel. One uses multiple stages to provide high DC gain. Unfortunately the multiple stages will need to have limited bandwidth to achieve stability. Therefore they put a high bandwidth single stage in parallel with it. Basically the multistage OTA acts like an open circuit at high frequency and all you have is the single stage.
I found another article from Thandri and Silva, JSSC, Feb 2003
http://amsc.tamu.edu/SIS/Publications/pub/jounal/2003_6.pdfFeedforward is old but suffers from "doublets" which cause slow settling time. Achieving feedforward with parallel OTAs is relatively new and I don't know a lot about the drawbacks. Have any of you used this technique?