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I have a family member on an IL-23 inhibitor

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Stelara I'm guessing? That would just be the most common one.

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1) Do you think the vaccine will not be effective for them?

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The study in question looked specifically at those on steroids and B cell depleting agents, which are more profoundly immunosuppressive than interleukin inhibitors and more directly interfere with antibody generation and vaccine response.

Interleukin inhibitors increase the risk of specific types of infections (such as tuberculosis reactivation) based on their mechanism and you shouldn't receive live virus vaccines while on them, but they are less likely to prevent an appropriate response to vaccines. It's a risk, but nowhere near as much as so as with the agents in question.

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Is it even worth it to get an antibody test at this point given that it's been over three months post booster shot

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I can't tell you if it's "worth it" but with an appropriate vaccine response you should still have robust titers at 3 months out. If they get it done just be sure they are checking specifically for the spike-protein IgG neutralizing antibody.

I'm on remicade. Yes, it's worth getting. I did feel a reaction after the first and second dose. Especially the 2nd. So it did kick in.

The fact is, if one is immunosuppressed than it makes sense that they could be at more risk for catching the virus, so they probably should get the shot given their condition.