You said it yourself. The tags are just estimates, based on a selection of tests from quite a while ago. And Jisho doesn't directly create the data themselves, as with most of the other content. They use freely available databases.
I'm already aware of everything you've said. But being tagged as N2 and being on an N4 exam is a HUGE discrepancy. I just wanted to point out that it's a word that people should know by N4 level (because I completely missed it).
In what section did the word appear? It is very different if it appears as part of a sentence in the reading section, than say as one of the entries in the vocabulary exercises. Also note that you are not expected to know absolutely every word that will show up in the exam, they will always throw in words you are not supposed to know precisely because they try to mitigate people just memorising list of words instead of absorbing the language (that's the reason why there used to be official vocabulary lists for old JLPT levels but they removed for the new version of the test). Anyway, as long as your skills match the corresponding level, you should be able to get by fine.
Was in JLPT N4 this year.
Just thought I'd mention it since the difference in level it's tagged as is super lopsided (N2). The contents of the exams are different every year, but either way it's something to keep in mind.