FTA:

Just because science has solved problems in the past we cannot be sure that it will always do this. What theists want to do using this idea is to counter the response “science will get to that one day” to the problems they suggest. When atheists make claims like “you can’t use fine-tuning against me because that’s god of the gaps.”, the theist can respond that this argument is “atheism of the gaps” – it’s a blind assertion that science will solve any problem to do with the unlikeliness of human existence.

The author is arguing that this is more of a strawman argument thrown at atheists because of the effectiveness of the “god of the gaps” fallacy in debates. If you make the assumption that science will eventually answer all questions and solve all problems, then you might be falling prey to a similar fallacy.