Calling it a false positive is entirely in line with the historical use.

Back in the 1980s or earlier it was called a "false drop".

Knuth, for example, talks about it in "The Art of Computer programming", v3, section 6.5, "Retrieval on Secondary Keys", using cookie ingredients. (See https://archive.org/details/fileorganisation0000thar/mode/2u... for Tharp using the same example.)

Bloom filters are a type of superimposed coding.