There are better tools for software developers now than in e.g. 1996, so the pace of writing software has indeed increased, but certainly there has not been any 100x speed up.

At best there may have been a doubling of the speed, though something like +50% is much more likely.

Between e.g. 1980 and 1995 the speed of writing documentation has increased much faster than the speed of writing programs has ever increased, due to the generalization of the use of word processors on personal computers, instead of using typewriting machines.

Many software projects might be completed today much faster than in the past only when they do not start from zero, but they are able to reuse various libraries or program components from past projects, so the part that is actually written now is very small. Using an AI coding assistant does exactly the same thing, except that it automates the search through past programs and it also circumvents the copyright barriers that would prevent the reuse of programs in many cases.