If true? It's 100% true. Finance guy cleared it with the boss.
When he asked me about a down, I asked if I could put it on a CC. He said, "Sure." My response was, "Careful what you say, you didn't ask me how much." Initially they agreed on $25K and when I waffled on the MaxCare, evan at $100 over cost, he sweetened the deal with the offer to take the entire amount. And since the Maxcare went into the deal, I didn't pay any sales tax on that.
I actually split it to get rewards points on my Amex Gold and airline miles on my Chase UA club card though I could have put the entire $30K on either card. It's not like I agreed to eat the fees, this was on the already negotiated price.
I once paid a $20K dental bill on my Amex. It never hurts to ask.
Years ago, I knew an IBM sales manager that walked in and tried to buy a Corvette with his Visa. When the dealer declined, he lit into them about the "We accept Visa/MC/AMEX" on the Door. As I recall I think they ultimately agreed to something like $40K on the card but he probably ate the fees.