No, benchmarking aims to identify the peak performance of a service, not the average customer experience. Real Benchmarking is done for people who are serious about performance. marketing benchmarking is designed to attract naive customers.

As for the latter, that benchmark wouldn't reproduce and would require extensive configuration (which in a sense is just a part of negotiation between the customer and the client). If a company got caught faking benchmarks run by competitors and it could be shown publicly they did, that's pretty much the end of that company's public reputation.