ARG is not a good pollster, but fwiw. I'd just note New Hampshire is weird- it allows undeclared voters to vote in its primary and New Hampshire has a relatively large pool of such voters. And from polling, these voters are mostly Haley supporters. So even if she wins in New Hampshire, it is unlikely to be replicated. As a case in point, Haley is losing her home state of South Carolina by a lot.
One reason to discount Haley in New Hampshire now is Ramaswamy has now dropped out. Most of his supporters probably will go to Trump. So another way to read this poll is Trump 44% to Hale 40%.