Depends no? If your "100%" is based on the after value rather than the before value, you have added 100%. Though I guess there is an implicit expectation that it is the before value that is used.
It went from having 0 pattern matching to having 1 pattern matching -- that seems like '100% more of this thing we are talking about' to me. This of course only makes sense if you see '1 pattern matching' as a precisely defined abstract construct, but I guess the 100%-more joke usually requires that perspective (and is a joke precisely because it's so non-sensical to think this way).
This is what people normally learn in primary school about the meaning of this phrase.