I mean, I'm confident that the core of how it works -- "an exact match between the tokenized document and the tokenized query" -- hasn't changed in a very long time, but I can't really promise there wasn't another aspect I'm ignorant of that is responsible for the behavior you remember that changed somehow.

"Exact tokenized matching" can look like "exact string matching" a lot of the time. Until you hit some of the edge cases it's like kerning: https://xkcd.com/1015/