I looked under mine this morning and I have them. I have a 2018 M2 built in March 2018, and had the MPE installed at Sun Motor Cars in June 2018.
I don't think they are meant to be removed and guess they were put there to address the tip rattle.
I found this video, uploaded Dec 3rd 2017, that has the clamps installed. That's the earliest I could find in doing a quick search.
Good find though. Because I thought the change was that they used a new clamp where the MPE connects to the OEM pipe.