If he is trying to say that, then he has my sincere apologies, but it doesn't read like that, at least to me.

eg. he says "the names of other browser engines", not "the name of the browser engine our code was originally based on".

The "like Gecko" part is a bit of a red herring here and mostly irrelevant, as that is simply what KHTML/Konquerer used in its own UA ("KHTML, like Gecko").