Impact is not a measure of whether a source is reliable, peer review is. One can argue that journals with higher impact factors are likely to have more rigorous peer review, but the AfD's have not talked about journal impact factor.
Note that TOPLAS, a source for the Nemerle article, had an impact factor of 1.92 in 2010, the highest PL journal, and among the higher CS journals overall.
Also note that the high-impact CS conferences are peer reviewed. This fact, and the general importance of conference publications in CS, appeared to have escaped the participants in the AfDs I looked at.
The article was deleted for lack of reliable sources: what does the number of citations that this or that article has have to do with that?
Nazi/asshole/whatnot - These people are pathetic. Don't be put off by them.