First off, thank you for providing. This was the most thorough list of sources given by anyone.

The buisness.com article is based on a survey of remote workers. The survey states that remote workers feel more productive at home and that they work longer hours. This correlates with anecdotal evidence presented here, but it isn't a measure of actual productivity.

The Monitask.com article refers to two studies that make the claim that remote work is more productive, but one study is blocked by a paywall and the other study isn't even linked. There is one article about a call center in China, which the Economist article I've posted notes that later data shows that the work was not as efficient as previously stated.

The ApolloTechnical.com has a lot of good articles, but there are some self reporting surveys. The article does note that not all research indicates increases in productivity, including one study in 2012 and reported in the Journal of Economic Behavior and Organization that found that creative tasks see increases in productivity at home while dull tasks see decreases in productivity; I like this study the most as it seems to do more academic rigor of creating an experiment to study against.

The businessnewsdaily.com article is another survey of remote workers, so no objective study on productivity.

There is some good science in the articles you posted, but there are also a lot of self reported surveys. Given what you presented, I can see someone believing that remote working is always more productive.

That said, there seems to be additional studies being performed that are making the claim more disputed. However, the articles you provide also give other very good reasons why remote work should still be allowed.