Why did he want to zoom call (please see details)?

I know a guy through common friends ( we live in different countries but met in person once where we went on sort of a coffee date). We have a bit of history where we started talking because I reached out to him for help related to my studies so like a mentor but since we had a lot of similar interests, I liked him, told him I did and he said he did not see me as someone he'd want a relationship with. He used to be hot and cold and it kinda ended in an argument. We did not talk for 6 months.

Fast forward now, I reach out to him again (messaged him in a strictly professional tone) because I had questions about my career that he could really help with. I kept the texts super formal. Now he insisted we talk on phone to discuss and I said yes assuming he meant voice call, which we always did for such discussions. Then he asked if I could send him a zoom link. I again thought maybe he just wants to keep it professional and we would keep our cameras off. But we had a video call, why would he suddenly want to video call?

Updates
5 mo
Just to add to that, everytime we talked before this was only on text or through a voice call on whatsapp
Why did he want to zoom call (please see details)?
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