That's clearly the case here, in late 2015 when i first discovered Bitcoin, as I remember, the price of 1 full bitcoin was hovering between $80, $90 to $100, so half a bitcoin by then would only worth about, or less than $50, so this user might not consider this a lot of money to go after or bother withdrawing most especially , if he was into some business that pays him more.

But considering what half a bitcoin is worth today, its understandable why the user came back seeking how to get that bitcoin back, but unfortunately, its gone, 7 years ago is a long time, and I personally will give up on any money anybody owe me for this long, even for 3 years.