I think that without uploading or creating copies (and without AI) any life extension method would give 1000 years life expectancy maximum

That was Aubry de Grey's estimate of how long people would live if we cured aging, but that assumes the same rate of deaths from accidents, suicides, ect as we have today. But with advanced cyborg technology, medical technology, biotechnology, and/or nanotechnology, as well as other technological improvements that reduce the risk of accidental death (self driving cars, for example), that could be a lot longer.

Edit: To be clear, I agree with you that if uploading/"making copies" proves possible, that that could theoretically grant a much "safer" kind of longevity that could last much longer on average. I'm just saying that even without that, 1000 years is just a starting point towards what's possible, and we likely be able to do significantly better then that.