Reading comprehension question.

Dear Mr Qasim:  Sir, I am not sure I would "interpret" (I live in North America and am a native; my name is Hispanic, but I grew up in North America in an Anglic family) the English as an issue of 100,000 year or 200,000 years, but rather as something more uncertain.  I think your translation is actually, quite right, but I think there is a nuance where the statement is either purposely vague or perhaps not quite so clearly written that you might want to think about.  The sentence is ambiguous and deals with approximations.  Perhaps it could be rewritten as, "began not on the order of  tens of thousands of years ago, but on the order of  hundreds of thousands of of years ago."  To my reading, the author addresses an idea you sometimes see, at least in the Americas, of "an order of magnitude."  It's a logarithmic thought.  An order of magnitude deals with 10's, 100's, 1000's, or 10,000's.  After you (if you think it worth your time) read the link below, you'll be able to make up your own mind about what the author meant and be as accurate as anyone else.  The statement, to my reading, deals with approximations and is purposely vague, acknowledging uncertainty.  You also sometimes see the idea written as "10 fold"  or "a hundred fold."  I consider the latter perhaps formal and near archaic, but that's a subjective opinion on "fold."

https://en.wikipedia.org/wiki/Order_of_magnitude

I hope the post helps and is worth your time.  Perhaps the author wrote something a but unclear and your understand of the language exceeds the thought put into the sentence; ditto for my post.  I hope you at least found the paragraph interesting and helpful

Warm regards and yours most respectfully.