This depends on where you live and what the facility is like, no? At least in Germany, patient records like therapy notes are only hard copy. I don't see why they should ever be digitalized and I'd never go to a therapist or a facility that did have notes in digital form. I'm not particularly paranoid either, I'm just aware of how common it is for companies to be hacked and how rarely they face any consequences for not sufficiently investing in IT security.
Even if something only exists as hard copy today, who knows if it will stay that way. Some new regulation might come along requiring practices to digitise all their records.
>why a paranoid person like me might abstain from ever seeking counsel from a therapist
one of the benefits of therapy that you are missing out on is learning that what you are ashamed of is much less important than that you feel all that shame toward yourself. everybody else has much they are ashamed of, it's not a big deal
I don’t know if it would work but you might ask the therapist to have in writing that they will never take records of your sessions except for the bare minimum required by accounting.