Because the laptop doesn't help the narrative. Anything that doesn't follow the narrative disappears.
If they reported on the laptop it would lead to questions about why Trumpy asking about Hunter Biden bribes is an impeachable offense if the IRS is crying about no taxes being paid on those same bribes...
Meanwhile 24 / 7 Jan 6 coverage runs interference for the far left's 8 months of "fiery but mostly peaceful" riots. In their minds 8 hours of [possibly] right wing riots gets them a get- outta-jail-free card for supporting 8 months of communist looting and burning.