ANSWER: 

Prohibition of cutting hair this way is mentioned in sahih bukhari and muslim. What this mufti said holds no ground. 

Kindly refer to the following link(s):

i have asked a mufti in uk for his oponion on haircuts of men. he replied the hadith on where the prophet seen a boy and told him to leave it all or shave it all was to avoid abnornamilty as his haircut was strange with only pony tail at top.he said some scholars in past held this opinion is this correct that there was difference of opinion on this