This is not the M1. You can’t configure a MacBook Pro 16 inch (stated in the tweet) with anything other than an M1 Pro / M1 Max, or M2 Pro / M2 Max on the latest models.
It’s the 13” MBP. If you look at the metal overlay in the corner it shows the product name of the processor, and in this case, it’s the base M1 with 16GB of memory.
The 13” M1 MacBook Pro does not have the pro or Mac chip. Not sure that’s what is being used here, but your assumption that this combination isn’t possible is false.
I knew about the 13" M2 MBP (although it seems very easy to forget somehow), but maybe due to marketing materials I encountered, I'd incorrectly thought that product line started with the M2 not the M1.