Why did you choose the three coins?
VeChain - Good, but not fast progressing
Tron - Good, but prices tend to be stable
Ripple - Not good because it's having trouble with the SEC
I believe he intends to invest in those coins because they have good market capital, listed among top 100 coins, have good publicity but have a low price which he thought they will give him possibly x100 profit in the future and he doesn't understand things don't happen like that in cryptocurrency investment. Besides, all the listed coin are highly manipulated coin
That is not really a horrible idea. Find coins that are inheritly known a lot more than other coins, be down for certain reason for now, invest into it, wait for the price to go back to where it was once upon a time and you can get super rich.
However I doubt you can make a 100x return from these, I mean I don't know vechain, but XRP is at around 32 cents, 100x of that would be 32 dollars, which I am pretty sure won't happen, or if it does that means we turned into purely crypto world, or tron for example Tron 0.03 dollars could become 3 dollars, I am not sure if it would be that high, sure it could be higher than 0.03 no doubt but 3 dollars seems a bit unlikely. Long story short the idea of "buy when it is undervalued because of a reason, sell when it gets back" is a great idea and I support that, I just do not think 100x would be in the play for them.