I watched the video carefully and attentively. Personally, I lean very heavily towards a pre-tribulation rapture. Did the video challenge me in my thinking? No. It didn't give any information to challenge the pre-trib belief. The video was made in the hypothetical situation that the world has entered into the tribulation period; that the pre-trib rapture that many were expecting didn't happen and that those folks are now scared and don't know what to think.
Frankly, I found that a bit condescending. Why would he assume that, in the case of a post-trib scenario, everyone who once held to the pre-trib theory would suddenly become stupid and run around without a clue as to what's going on? That's actually more revealing about what HE thinks of those who currently believe in a pre-trib rapture. Those I know who are also pre-trib believers are nothing like that. In the case that the post-trib theory is true, pre-tribbers are still going to know what to expect and not worship the beast or take his mark.
So, no, it didn't challenge my views of a pre-trib rapture. Whatever the true eschatological facts are, no one can say with certainty because God has seen fit to keep this hidden as one of His mysteries. No one can say they've studied, prayed, fasted and heard a definite answer from God that the viewpoint they arrived at is THE correct one. What's important is to keep watching, hoping and expecting Jesus to come at any time. But, to also keep living our lives as if we have the whole of them to live out. We are to remain watchful but continue the work that He gave us to do and complete it for His glory only.
Now, regarding the 45 day window that the creator of the video is talking about, I have to say that I agree with him. I believe there is a window of time for Christians during that time in history to expect Jesus to return in. (Just like they waited, expectantly, in the upper room in the book of Acts.) It's just that, to pre-trib believers, that's known as the second coming of Christ, not the rapture. Once the tribulation period begins, it's very simple to narrow down the time of the second coming based on the timeline and events described in Revelation. It will be the blessed hope of those who endure the tribulation period.