I notice that in your suggested text you linked "Perl programming language" to perl.org. Is this necessary/important?
Not particularly. I just thought it looked like a good idea.
Care to summarize?
They search on 9 different social sites for "<lang> programming", assign the results a weight based on the specific site and combine everything in order to produce popularity values for languages, which usually prompts journalists to proclaim perl dead because tiobe is mostly blind to perl activity on the internet.