What I suppose to do?

I was using Scrapebox to check all the domains that I did guest post with, when the result come back, it showed some of the websites are not or no longer indexed by Google. For example: russiatrek.org and onestep4ward.com
however, when I checked the actual URL for my guest post in Scrapebox, it still shows indexed. Is this accurate? How the website (domain) is not indexed, but the guest post on that site is still indexed? Is it possible those sites has been penalized by Google because they accept paid guest post? Should I disavow those post(link)?
Thanks in advance

type the actual URLs (that give you the backlinks) in google and if you see them they are still indexed. Otherwise they're not indexed anymore.

Also, don't make sites public on the forum as bad things might happen to them (and to your backlinks as a result)

usually you don’t need to disavow links. but it’s better to check before if the sites are still indexed.