I was laid off by my last employer in early May. Now I have a question regarding answering for the potential I-485 RFE requesting for employment verification letter. I was told that a future similar position will be enough for satisfying the I-485 employment letter request. Is that true? Can you confirm on that?
That is correct for AC21 portability. But USCIS can ask why you are not working for that employer right now. If you have a good, truthful answer for that question, you should be fine.