AIMA lists, as one of the benefits of the ARI,
“Request the acquisition of Portuguese nationality, by naturalization, fulfilling the other requirements of the Nationality Law (Law no. 37/81, of 3 October, in its current wording).”
The linkage is very clear.
https://aima.gov.pt/pt/viver/autorizacao-de-residencia-para-investimento-art-90-o-a