It's possible to use a bloom filter variant of this for text search (for example, Bing does this, see https://danluu.com/bitfunnel-sigir.pdf for details).

If you wanted a very small bundle to use with a static site, I don't think it's obvious that a bloom filter variant is a bad approach.

I mean, yeah, this thing that the author said "made for a fun hour of Saturday night hacking" is probably not the optimal solution, but that would've been true whether or not the author chose to build something based on bloom filters or an inverted index.