From the source code:

if (jde.getMessage().equals("EXECABORT Transaction discarded because of previous errors.") ||
        (jde.getMessage().equals("EXECABORT Transaction discarded because of: OOM command not allowed when used memory > 'maxmemory'."))) {
    LOGGER.error("Redis runs OOM", jde);
}

First message does not mean an OOM error but and OOM error is logged anyway. It should be avoided (or, some other error message can be put).