In my perception, "true conservative" means "what the label meant in my youth, not what it has mutated to today". I think it is exactly a recognition of the past.
I agree that this is the claim of self-described true conservatives. However, I think the claim is empirically false, and they do not actually follow what the label meant in our youth.
Well, I was mainly referring to politicians and other prominent persons. I'm not denying that anonymous individuals exist who have remained consistent over the decades, but they don't seem to have much power anymore.