If Apple had began reviewing when the downloads started happening, then it should've been out a few hours ago. I say the theory that Apple has ahold of 2.0 and went into CoinTest123 is wrong. As Evade said, there's no real good reason for them to do so. RobTop probably tested CoinTest123 on both an Android and a PC to see if they worked correctly before he submits it to their respective stores (keep in mind, the downloads started happening around midnight for RobTop). However, I do find strange that it's been days since the update was submitted, because Geometry Dash is in the Top 10, and that they haven't prioritized it because of that.
TobRop wouldn't make separate accounts for PC and android. And if you didn't know 1 account counts for 1 download.
Apple can take up to a day during the review process, so we can still wait till the end of today to see if it was reviewing.
Or he didn't sign in on those devices. Again, we don't know for sure, but I'm sure the theory that Apple is reviewing it is pretty much debunked, unless they started on it a bit then went off from work which would seem pretty logical.
Although Apple may not be reviewing the app, there's still a very high chance of them doing it today, as it is the 7th day and most of the apps that were clogging (at least, clogging from our prespective) the queue should be done by now. If it doesn't, then I think Apple should think twice about prioritizing free apps instead of the one that makes them more money. Though, I don't exactly know how much profit they get from a paid App vs free.