I couldn't find any quote that is even remotely similar to this in the article. Can you give more context?
It's probably a reference to the news article about Whatsapp increasing maximum group size to 256 and a journalist pondering over why such a specific number was chosen. OP probably meant it a similar sense, why was 65535 chosen (but it's not really such a mystery).
I don’t know why the author said that, Is it really unclear to why?