If naked corruption with a foreign country is irrelevant to the center, then every meme about centrists being absolute morons is true.
They aren't morons, they are somewhat willfully ignorant. The problem with the Laptop is that it isn't easily digestible, and the center generally doesn't care to look deeper. They also tend to not give two fucks about the media.
In the end, what catches the center's attention has to hit a few criteria.
1: It needs to be Easily Digestible.
2: It has to come from sources they like/trust.
3: It has to have a clear connection to someone or something in power.
The laptop failed all three.
Easy digestibility means they can wrap their heads around what it is and what it means on the face of it. "Hunter Biden had a laptop which had some weird business emails that don't totally confirm corruption but probably should be looked into immediately" is not an easily digestible thing. "The democrats stole the election" is, and easy digestibility is what interests them in looking to see if there is fire to the smoke. this leads to;
Sources. Nobody likes or trusts the media. Period. The numbers on that are so low that it's an immovable fact. Hence why the censorship has moved on to "Desperately try to make it not be seen at all". The center's primary source of info is word of mouth, what people they know are saying. The problem is that it only spreads if criteria 1 is met. So if you fail 1, you fail 2 in the current era. Same for if you succeed in 1.
Connections. This is where the laptop fails the hardest. "But Biden's son isn't Biden" is really the mindset here. And since there was so little properly connecting Biden himself to any of the alleged stuff it just pittered out with interest on the center. A proper investigation likely would have found something, but there wasn't one sooooo. But again, election fraud emphatically meets this. "Biden won because of fraud" is a -direct- connection to the center.