This guys argument is based on a meta-analysis which has nothing at all to do with the argument he is making. The meta analysis in question (https://files.eric.ed.gov/fulltext/ED610568.pdf) is talking about how different research techniques measure data in different ways and therefore can't be easily compared. He then takes a look at this data, determines that it means interventions don't work very well (he doesn't argue they don't work, just that they don't work that well) and therefore concludes that we shouldn't even try to close the gaps in educational outcomes. You can't read a study and completely change it's meaning, especially since the study he cites is from researches that clearly believe evidence based educational intervention can work. In other words, the people who the author cites, who looked at the data more closely then the author hold opposite beliefs from the author.