Places that don't hard roll usually won't let you roll on the first day.
When I was school shopping a few months ago, I tried like 3-4 different grappling schools.
One BJJ place I went dodged me. I took their class, then wasn't allowed to roll with their white belts, cause I'm a white belt. The two purple belts wouldn't make eye contact with me during the rolling portion. I only rolled with an old man blue belt who got his belt from another school. Their technique was naive and I wasn't impressed, but they went hard. They were just bad / scared.
I went to another place where the head man took one look at me and decided I was fine to ignore. I took the class, then rolled with whoever. He didn't even monitor me. His middling purple belt wrecked me and then he got around to it after he rolled with he upper belts. They were beasts and they rolled hard.
So anyway, when "the school doesn't roll hard" it is sort of like Karate guys not sparring with outsiders. It is because they don't have real confidence from actually being good. They have fake confidence from narcissistic pageant culture where you line up with your belts and kiss ass.