As part of the investigation, officials had contacted Morales Reyes and asked for a handwriting sample and concluded his handwriting and the threatening letter didn’t match and that the threat was not credible, the person said. It’s not clear why Homeland Security officials still decided to send a release making that claim.

What’s “not clear” about it? They sent out a press release making that claim because they’re dishonest sacks of shit with an agenda, and that claim served their agenda.

It’s not complicated or even surprising - it’s just standard operatong procedure for the Trump administration.