No, there is / was more to it than that. I was considering purchasing it in 2020. It's been 5 years and have no idea where I have the info now, but I'm pretty sure there was more. I remember GM or someone saying it was a must for dealers to purchase it. Likely not now, but that's what I heard at the time.
Edit: From John on midengine in August of 2020.
The answer to your question as to tools is that a dealership can not work on nor sell a C8 unless they have purchased the C8 specific tool package (total cost of $1,454).
Interesting to review them one by one. The most expensive one, a tool we expected to be on it, is a specialized “transmission support/service feature” (a cradling jack @ $441), e.g., a DCT transaxle is a costly piece. Then there is a manual park release wrench at $331; also required for such work is the $57 “support mount transmission table.” Another major one is the $200 “engine support fixture adapter.” All of these things we are not surprised to see for servicing a mid engine vehicle.
The rest are 10 more minor tools costing a total of less than $400 collectively.