How? The laptop does exist, so at a minimum this is not an outright fabrication, allusions to which I've seen several times in the comments here. The veracity of the photos of crackhead Hunter seems to be also beyond reasonable doubt. As is the fact that he was magically getting millions of dollars for things he has no expertise in, for some reason. The veracity of emails can likely be confirmed by the FBI using DKIM.
A better question would be why this did not come up during the impeachment hearings. There's some exculpatory evidence on that laptop.
And to answer your question, the intelligence community believes that this is GRU disinformation[1]. So that is why this wasn't used in the impeachment hearings. And also why the FBI is not investigating this.
[1] https://thehill.com/policy/national-security/521328-intellig...
Also, you might want to avoid such categorical statements, because one of Devon Archer's business associates has recently flipped and provided his emails as well. Those corroborate the "China" arc of the story. Note that the story you linked is a repost of a WaPo story, which itself has no on-the-record corroboration from ODNI, FBI or DOJ. So I'm pretty sure it's fake news.
It was a meth pipe. If you got something so basic wrong, why would anything else you said be true?
And please post links to your sources. Until then, I am going to go out on a limb and assume that the reason you are not doing so is because they are also coming from sites with little to no credibility.
Everyone is aware that Hunter has had drug issues. But HN is not the place to be calling someone a crackhead. Go to reddit for that.
That doesn't corroborate the story, it compromises it.