To be fair, if it's a troll account the owner would do exactly that in order to further mislead people. He would pay close attention to Phil's stream times and be active accordingly. Yes, it would be an incredibly dedicated troll, but we already know that from how much money is involved. So if it's a troll account and they are putting all this money into the game, it's not a big leap to assume they'd also be crazy enough to match Phil's schedule.
If it was a troll they'd be trying to drop hints on the discord to convince us they were Phil and draw attention to themselves. Plus as already mentioned their whole plan was to act like Phil for months on end in the hope someone would eventually stumble across it.