- They found a higher rate ("almost half") of autistic children "creating imaginary friends" than prior research.
- A comparison is drawn between autistic children with imaginary friends versus autistic children without. Those with had "better social skills" than those without.
- Prior research has found a similar difference in the general population (non-autistic children).
As such, the title is technically ambiguous but practically speaking, not.
The truncated HN headline is a little ambiguous, though the most natural reading is correct; the full source title / subtitle is not ambiguous at all:
“Autistic children with imaginary friends have better social skills, just like neurotypical children / Results suggest that pretend play provides similar social benefits to autistic children as it does to neurotypical children.”
Constraints force compromise.