It doesn't look like it. The function of the removable bolt on clips is so teams can replace the front or rear instead of having to build a whole chassis. The car does have some pretty massive foam behind the front and rear bumpers.
This is a pretty thorough article from Car and Driver:
Previously, raw steel tubing would enter a race shop at one end, and a tube frame would exit the other. That is no longer the case. Michigan based Technique Inc. will provide all the frames,
which now consist of a common center cage with bolt-on front and rear substructures. The idea here is that when an inevitable crash occurs, the bolt-on structures can be replaced rather than cutting up or throwing away an entire tube frame, and in turn, this should help reduce operating costs.
NASCAR's seventh-generation Cup car modernizes the racing body's premier series racer in big and small ways.
www.caranddriver.com