Youtuber intends to ride GTA 5 until Rockstar Games releases GTA 6
It sounds like another of these declarations, which is only thrown to make some noise around the person - and this is probably one of the goals of youtuber called 100HoursMovies. This GTA lover has taken the challenge surprisingly seriously and has been playing it for over two weeks without a break. He says he wants to beat the world record in playing the game.

It should be remembered that there are bots that allow you to automatically drive a car in GTA 5, although it is difficult to say whether the originator of the challenge plans to use this type of tool. Talking about his idea youtuber uses plurals at some point, so maybe he has some "helpers"? The idea is absurd enough to expect everything.
It is very possible that this is simply a way to improve the budget, because the GTA fan accepts donations from viewers.

So far Rockstar Games has not oficially announced GTA 6 at all.
The project can be followed live on the YouTube platform.