Check usergroup of thread starters in threadbit

[addamroy]

I'm looking for an if condition that can check for the usergroup of the thread starter for each thread in the thread list via the threadbit template.

In posts I show certain content in the postbit_legacy template that only shows if the thread starter is in a certain usergroup. For that I use the following condition (where 60 would be the usergroup id)

<vb:if condition="is_member_of($post, 60)">
Show content here
</vb:if>

However I this condition doesn't work in the threadbit template.

Just edited this, I just need a thread starter conditional for the threadbit template.