Aren't emojis pictograms and ideograms but not usually logograms? They're direct depictions of concepts, not usually direct stand-ins for words like logograms are.

Better examples of logograms in English I think are &, $, %, @,+,=, etc. We actually have a bunch we use all the time.

Specifically they said 'Kanji', though, so I think they're talking more about the actual character structure of ~~:.|:;~~.