The hack has no known impact on spiders as it both excludes them and uses cookies, which they [spiders] do not use. Just like a guest on their first view aren't blocked, a spider (which has only one view) is also not blocked.
The error "not found" refers to a page that produced a 404 response when Google tried to crawl it. You should be able to drill in and see which pages produced this error and fix those links. LGV does not produce 404 errors at any point as it does not send out http headers.
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