Oh yes, he did say "missing from the IMCDB model search".

Even if you type "DeLorean" the site gives you the "De Lorean" results, so I wonder how weathersh09 did his search
Maybe it was because the make was not in the makes list of the home page? (only makes with 100+ vehicles or something like that are there)

Didn't it occur to you to look up Back to the Future and see whether the De Lorean was really missing?

It's De Lorean. Two words. That's why you found none on your search.

53 are listed

We can't be allowed to forget about the DeLorean. I noticed that particular vehicle missing from the IMCDB model search. Aside from being one of the stars in all three Back to the Future movies, it was also driven by a character in the movie Wedding Singer, with Adam Sandler.