Being able to get erections by thinking about sex again?

I recently read a post on r/showethoughts with part of the title being If I think about sex, I get an erection. I haven't been able to do that since I was 11 or 12 before I discovered actual porn.

Even after periods of 8 months of porn abstinence, I'm still not able to get back on that level. I've never actually had to perform yet but I'm worried if this is indicative of PIED, and if I'll ever truly be able to get to the level of erectile health I was at before I feel deep into the porn rabbit hole.

Thanks.