it's impressive, but you also have to put the languages in their family groups to see how he can learn so many i.e.
english, german, dutch, afrikaans, then
french, italian, spanish, catalan, then separately,
greek,
russian,
hebrew.
once you can speak one language from the group the rest fall into place. the skill is in having the time to learn the five different 'families'
i wonder what he is going to do with all of them?