It doesn't matter.
If you are doing comparative shopping for your boat or even for someone else, it is the costs that are quoted to you that matter.
That's all.
Last week there was a discussion of how slip prices are determined.
Same answer.
All that matters is the $$ bottom line for your boat.
I used Yard GM for many years until the crook of an owner and I had a falling out. I fell out of his yard! I moved to Yard S. All I cared about was Yard S's cost for the same work with the same or equivalent paint. I also checked with Yard K, who were essentially the same but a three hour sail and three hours back. Wasn't worth it even if it had been $300 less expensive.
It's called comparative pricing. Or ask your wife about comparative shopping!
So tell your buddy to read this post.
PS - You could also analyze what makes up a bottom job. A small portion of it is the paint and labor.