I believe you are right. I should’ve been clearer in my original post, but I was envisioning getting the memories/upload state into the brain of the new body, not staying as a digital copy. My thought was that if you included memories up until the moment of death for your original self that it could be a semblance of “seamless continuation” because the clone would indeed think it is the original. However, at best, like you pointed out, it isn’t so much extension of life as replacement.

In the scheme of things, my preferences for life extension tech methods in order of “preserving the original” would be: organ replacement -> nanobots/gene tweaks -> cyborgization -> cryonics -> mind uploading to a new body

I suppose a matter replicator could advance tech in each area to make them more likely to occur though given that research would no longer have material constraints.