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Shinra is not actually supposed to be an ancestor of President Shinra from FF7. One of the FF10 writers found it amusing that they tried to craft a new world and ended up with something akin to 7, particularly the idea of a Lifestream. The Shinra character was added as a reference, just as Biggs and Wedge are a reference. He confided this to
Ultimania.
10-2 expanded on this with mentions of him and Rin trying to use the Farplane as an energy source and looking into space travel, but while it's a fun theory, there's no actual evidence they made it out of Spira. Not to mention that in 7 they have a space program and failed rocket, implying they never even achieved space travel until the huge materia launch, so
how would Shinra's descendents reach this new planet and then become space amateurs?
A lot of people went batshit over this and the devs went along with the joke. A fun gag which will fuel many 10 minute long "theory" channels on YouTube.
tl;dr He's just a kid. Imagine if they pulled Sin into the remake, tho.