Introduced April 7, 2015
12.2 MB of packet buffer is a clear mark of a Broadcom Trident-2.
There is a data sheet, but it isn't terribly helpful. Much better is the switch product guide that has info on data buffering. Note that the word ONIE does not appear in the product literature. The switch is available with two software loads: enterprise and cloud.
The introduction date indicates the Lenovo was late to the party relative to other vendors. I don't think they did anything wrong -- they were not in the first wave. This switch has a logical successor with an amazingly similiar front panel layout. https://people.ucsc.edu/~warner/Bufs/Lenovo-NE2572.html