I would not necessarily go as far as calling it fraud, but if you cannot even verify that the reference you are citing actually exists, you are not ready to publish research papers.

Deadlines are not an excuse here. Checking whether a cited book, paper, or passage exists is the absolute minimum standard for scientific work, not an optional extra. I have written academic papers myself, and I find it astonishing that people are trying to justify this as if it were some understandable workflow mistake. At that point it is simply slop with academic formatting.

A one-year ban is not a lifetime ban. Maybe six months would also have been enough, but the point is that the author gets time to think about whether they should verify references next time. They can also use that time to manually check every other citation.