The name of that scholar is Muhammad 'Afifi al-Akiti. He is in Oxford and is originally from Malaysia. His answer on this issue is on the website of a person called Gibril Haddad. Regarding the matter of taking fada'il from weak hadith remember that it is conditional upon the hadith not being too weak. And this hadith comes in the collections of mawdu' traditions, not just weak. It cannot be used as proof for Al Siddiq's practice either because of its severe weakness.