Try asking the content owner directly, asking him to reupload, instead of waiting for someone among 180 leechers.

Forgot about that, thanks for raising the issue.
The ID should be in the next export.

There's no such option, but I can delete the database record if you wish.

From FAQs :

Why doesn't Anime Tosho fetch raws, remuxes and otherwise large files?
    As mentioned in the above answer, available resources are the primary concern. Large content is particularly taxing on resources, expensive to cater for, and generally unpopular, so the decision has been made to drop these high-cost, low-reward releases.

TL;DR - The answer is No.

I think admin said "there's no such option" for account deletion. But I might be wrong.

That is why you should not register an users account on a pirate site with your real IP address.

Once the site is targeted by law enforcement, the first step is going after registered users, as it is easy to prove their involvement in court.

Beware, the site and the domain register are logging your IP address and collecting your data. Be safe not stupid and don't fall for users trying to sugarcoat the facts, admin feel free to delete my comment as usual.

what does the user acccount event provide why have the option to register if its not needed

If you put literally Anonymous as the name, the part with quotes will be omitted.
Some time ago you could leave the field blank for the same result.
You can also put some kinds of whitespace (e.g. a tab or zero-width) to get just quotes with nothing inside.

While we are at it, I suggest admin treating any whitespace-only names as blank. These empty quotes are only a visual noise.