My clients (extremely large) AWS based infrastructure experienced no downtime this year.
So, if it's based on some random person's clients, it's not clearly better at all.
I don't use cloud flare for anything, so no comment there.
>GP stated that their clients had experienced no downtime since switching at the start of the year
That's the least useful information.
What matters for his service availability is what he should expect going forward. What matters for reviewing his decision making process is what he should have expected at the time of choosing service providers.
You can use whatever infrastructure you want for whatever reason, but you may not have an accurate picture of the availability.