It’s buried deep in the article, but they seem to recommend:

the LEAP method. Developed by Xavier Amador, it stands for Listen Empathize Agree Partner, and is meant to help better communicate with people who don’t realize they’re mentally ill or are refusing treatment.

They link to https://namiga.org/resources/about-mental-illness/leap-assist-someone-accept-help/ which unhelpfully tells me my IP is blocked by CloudFlare because accessing that link is considered an “attack”