Will the CFPB provide an email to confirm that the HMDA submission has been received once we submit?

no.
You only have the last page of the submission which states that 'your submission has been accepted.'

I took a snapshot of my 'receipt'. I have heard, however, that folks are getting emails recently.

I filed last week and have heard nothing.
I opened up the platform today and it showed that my submission had been accepted.

I submitted yesterday and printed a screenshot of the "your submission has been accepted" message. No email or anything else so far.

No email for me either. I just printed a copy of the screen and saved in my file.

I submitted about a week ago, but haven't received anything. This is what some apparently have received by email:

Your Institution Register Summary (a disclosure report) is available in the HMDA Platform (its available for CSV download on the submission page. You can revisit the platform and download it at any time). Your modified LAR will be made available on the Bureau's website about a month after March 1st.

From HMDAhelp:
On the 2017 platform, Log into your account; select View Completed Filing and you'll get your submission number and confirmation of receipt along with some other info.

Anyone tried filing for an acquired bank when you want to file their data separately from the surviving bank because we had our collective stuff together and while we think their data is clean, we really don't want to co-mingle the data.

We filed on our other bank today and it was/would have been a piece of cake if IT hadn't flipped the order on some CRA Wiz updates that they batched...ultimately, it was surprisingly simple!