I'd like to retract my comments to some degree. I think the problem is definitions.

"SENS: Regular correction of accumulated damage." You can't just put that on a timeline without qualifications. There are 7 complex problems to be solved in SENS. If each one of them takes 10 years to solve, you're talking about SENS breakthroughs spanning 70 years. The only claim you can make for 15 years out is maybe one small breakthrough that partially addresses one of the seven problems. It would be nothing close to your characterization and wouldn't help us very much.

"Non self-replicating nanobots" I want to make it clear that you're talking about crude first generation nanobots, while I was talking about fully mature nanobots capable of cryonics repair. The two technologies are lightyears apart in complexity, capability, and timeframe. There could easily be 100 or more years of development separating the two. But your wording still seems to indicate intelligent swimmers with manipulators, which is more of an intermediate technology rather than first generation.