To shed light on what Mr. Chen is saying, what we need is your 2nd self-evaluation completed for your previous employer as well, but we only have the 1st one you submitted in March. Remember that any time while on STEM OPT extension you change employers, you must complete your self-evaluations—i.e. p. 5 of I-983—in full, regardless of the length of your tenure with that company.
So, to complete your update request, you will need the bottom portion of the attached page filled out and signed.