You and the author of that article seem to imply that there is some connection between the Equifax data breach and securing our domains. There is not. Nor is any info that might have been obtained from that breach relevant to accessing our domain accounts. I could know everything about you, your name, address and SSN, and that would not get me into your domain registry account. How many Equifax credit profiles have you seen in your life? There’s not even a record of a person’s email addresses or anything close on that report. No passwords nothing like that. And starting about fifteen years ago complete credit card and other account numbers stopped appearing on credit profiles - such numbers were all displayed in a jumbled, coded order. The point being that stolen credit profiles are useful for opening new identity fraud credit accounts but not for accessing a victim’s domain registrars.
That article includes general advice about keeping online accounts secure. That’s good. But his statement about trying to match stolen personal identifying information with domain registry records is a stretch, and even if that could be done, he doesn’t explain how such info could get anyone into your domain account.
It’s good to be vigilant but no need to worry needlessly either.