Listening a second time, I believe this IS J. Russel Robinson, since what he plays here is very similar to what he plays on his records with Al Bernard (as the "Dixie Stars").
It is easy to be fooled into thinking it's Mr. Brodsky if you don't listen carefully, since Mr. Robinson is "modernizing" his style into the late-20s jazz idiom pioneered by Arthur Schutt, Earl Hines, etc.
Also, Mr. Robinson is playing the same piano in the same (Pathe) studio as Mr. Brodsky did!
Thanks for posting this. Brian Rust's "Jazz Records 1897-1942" (4th edition) claims that this is actually J. Russel Robinson on the piano, and not Irving Brodsky.
Listening carefully to the piano, having heard many records by Mr. Brodsky, and a few by Mr. Robinson (plus a couple dozen of the latter's piano rolls), I am not sure. This pianist's phrasing is more typical of Mr. Brodsky, but then again, some of the actual FIGURES he plays are more typical of a ragtime-oriented pianist.
