I'm sure it doesn't actually matters to you, but anyone who is seriously interested in his campaign can just listen to it today. I listened to the first 15 minutes of it or so. Everyone already knew he was running for President anyway, this was just a promotional thing he did on Twitter, which people can listen to at any time. I'm not especially interested in his campaign but I don't think this had any impact on whether people would vote for him or not, it definitely got a lot of media attention for Twitter, which as always results in more people visiting the website.
That is some great spin. You want your launch event to be big news and on every show but not because it was a disaster. He is getting no good media today, its all about the disaster and how he is being mocked by his opponents and the internet in general. Are any of his talking points getting press? No they aren't.
It isn't the end of his campaign but he's now going to have to work hard just to get past this rather than riding a wave from a good event. Plus its just more ammo for Trump and his supporters to use against him.
And we don't have to be personally invested in something to find it interesting. Though who is leader of the US should matter to all of us. Personally I want a president who will stand by our allies and not throw Ukraine under the bus, Trump has said he will on day 1, DeSantis is making similar noises, hopefully that will change. An America that cares about Europe and its security is essential, an introverted America is the last thing we or the free world needs.