Deletion of Learning by teaching

Comment: As mentioned, I did not come with intention to delete. I am not questioning the notability of either the article or the subject. I was concerned with the |COI issue and asked for a review
Stance: comment
Cited policy: Wikipedia:Conflict of interest (WP:COI)

Comment: Jean-Pol Martin as  & "Redirect" Learning by teaching to Martin, as the method creator. "Learning by teaching" is way too promotional to consider keeping and Wikipedia does not need two closely related articles on this topic
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF)

Comment: but '''Split''' due to  and other problems. The LdL part with all its issues should be split off to another article with an AfD and leave only a paragraph on LdL in this article. I think all, including Martin, pass GNG
Stance: keep
Cited policy: Wikipedia:Neutral point of view (WP:UNDUE)

Comment: The topic has great notability, especially in the German language as '':de:Lernen durch Lehren|Lernen durch Lehren''.  For an example of a good source in English, see ''https://books.google.co.uk/books?id=8iwlDwAAQBAJ Learning by Teaching: Evidence-based Strategies to Enhance Learning in the Classroom'', which was written by respectable educationalists.  Note that the topic has equivalent articles in 11 other Wikipedias besides this one and that's a good clue that we should have this too.  Once again, note that  is not policy; not even a guideline; it's just a disruptive essay.  Our actual policies include: ; ; ; 
Stance: keep
Cited policy: Wikipedia:Blow it up and start over (WP:TNT||WP:ATD||WP:BEFORE||WP:IMPERFECT||WP:PRESERVE)