I don't think reddit will die, but they definitely hurt themselves. The fediverse grew by leaps and bounds over the past week, reddit drove so much traffic to their potential competitors. Then when the 3rd party apps die, they'll lose some more.
Reddit is gambling on gaining enough revenue from pushing people on 3rd party apps to 1st party that it makes up for the loss of users overall.
People on reddit say "Why do we care about 3rd party apps, it's such a small section of the userbase" But apparently reddit cares enough about that small section of the userbase that they need to push them to their own app.
Reddit already fudges numbers although not to that extent. If you go to someone's page from their profile and downvote all their comments it won't actually count.
Exact upvotes and downvotes are also a little fluid, it'll give you a number within a range but not an exact amount depending on the amount of interaction on a post.