Am I Wrong For Not Telling My Father and His Girlfriend If I Want The Child They’re Going To Have?

Let’s get one thing out here; I have only seen my father and his partner once, for a week visit in eight years. He and his girlfriend have never visited me despite me travelling across the country and my father abandoned me and my mother at birth.
I don’t have a close relationship with him and don’t consider him my father and I don’t consider his girlfriend a step mother, especially because he left and didn’t raise me alongside my mother.
I also haven’t really gotten to know his girlfriend since we live in different cities.

But he defiantly sees me as his daughter, I don’t have an issue with this but today he texted me that his girlfriend is seven weeks pregnant and asked me if they should keep it. He told me that because of their age (both 50+) he wasn’t sure and wanted my opinion on if I wanted a brother/sister.

Honestly, I don’t think I could see their child as a sibling simply because;
1. We live in different cities, I wouldn’t be there to see this child grow or bond with them as I’m eighteen and already deep in University and trying to find stable work.
2. I don’t see this man as my father or this women as my step mother.

I felt like telling him “yes have this child!” Would be promising that I would be around to play the role of an older sibling when really we’ll probably be more like cousins.

But I also didn’t want to say that and hurt his feelings and be the reason why they didn’t have a child they wanted together. On the other hand, I also don’t know anything about their relationship stability or their financial situation other than that my father has impaired memory and has to live on disability because of it.
I didn’t want to be the reason they did or didn’t have a child, and I didn’t want to give anyone the impression that I’d give up my life and move to live with them to help raise this child.

So I told him, “I’m not involved in your relationship, I’m an bystander and I couldn’t possibly make a call like that without knowing and understanding all the factors that go into raising a child with a specific person. I can’t say I feel comfortable saying “yes you should” or “no you shouldn’t” because it’s not my choice.” Then I told him, “I will support you both in either choice you make.”

He kept insisting and I gently told him I couldn’t in a passive manner and he eventually got mad and called me, yelling angrily, “Just tell me, this decision should involve you and since you will be apart of the family you have a responsibly to be part of the decision.”

I hadn’t been apart of this “family” since he left. I’d only recently started making an effort to mend the bonds broken and I’m still not completely comfortable with him nor do I feel comfortable being accountable for this kind of choice.

So I told him, “It’s not my choice and I don’t really feel comfortable making it my choice.” And hung up.

I got a lot of angry texts from my father and a passive aggressive one from his girlfriend.

Did i make the right choice? Should I have just told him that I don’t know/don’t think i’ll be able to uproot my life for this kid more than holiday visits? Should I have just said, i don’t think this child is a good idea or blindly agreed and said yes?