The particular Forbus DNA Connections page to which you linked is just showing all profiles with that surname that have any associated DNA test connection (it's not designed to indicate any relationship to you).
It appears that you've recently added a MyHeritage auDNA test to your profile. Within 24 hours, your test info will propagate out 8 steps from your profile to the DNA Connections section of your relatives' profiles based on the relationships that currently exist here.
If any other DNA test takers are also related within 8 steps of any of your relatives, their DNA test info should also appear in the DNA Connections section of the profiles of those relatives. If that occurs, it would be an indication that you might share DNA with the test taker via your common ancestor(s) with them. You'd need to compare the actual DNA with your potential match at one of the testing companies or 3rd party sites that have tools to facilitate that. The DNA Confirmation tab that you previously mentioned shows any such DNA connections that may exist for your relatives out to your 3g grandparents.
Based on the Relationship Finder tool, you do not appear to be related to Forbus-6.