it's to do with the nasalisation. the 'nt' isn't really there at the end of the word 'élérphant'. Rather, it's a nasalised vowel (linguistic term, if you don't know what that is/sounds like all I can offer is 'google nasalised vowel', sorry). it's like how, no matter how much you enunciate 'eight' you are NEVER going hear someone pronounce a 'g' in it.
Apparently, no liaisons after a singular noun! Just found out too.