First of all, do not cross-post. I have deleted your second post.
The information in that link you posted is mostly garbage. I really shouldn't dignify stupidity like that with a response. But I guess that's the only way to fight ignorance.
The 5100 was wimpy computer even in it's own day. It cannot be used to correct a modern os. It can't even store a copy of a modern os.
The alleged time traveller
states that he travelled back from 2036 to correct a unix problem that will occur in 2038. There are two very well known problems that will need a solution before then, but only one can be called a unix problem and it is nearly solved.
Jan 19, 2036 is 2^31 seconds after the unix epoch and it will overflow a signed 32 bit integer. We are starting to move to 64 bit systems now. Assuming that we retire 32 bit systems by 2038, the problem is solved. HP has stated that this is their solution for HP-UX.
A second problem will arise at the same time with the NTP protocol. The NTP protocol will need to be extended in some way prior to 2036. Admittedly we don't have a definite solution yet, but their have been proposals. I'm confident that we'll settle on a solution by then.
This problem is trivial conpared to y2k. And that was a very minor problem.
But if we fumble somehow, the solution will not involve returning to 1975 to snag an old IBM 5100.
And even if it did, we could not get our computer clocks to work, but we can build a time machine? Whoa....