Jamitz44085 It's hard to say.
Maybe your YouTube viewing had somehow been suggestive of you being the sort of person who might watch Andy Samberg (even perhaps if you haven't yet watched Samberg on YouTube) , and maybe YouTube "knows" that people who watch Samberg tend to watch that episode of "Find Your Roots" when they find out about it, so it made the suggestion without knowing you listened to him talk about it on AntennaPod.
If YouTube had suggested that "Find Your Roots" episode a day before you listened to the podcast on AntennaPod, instead of after you listened to it, you might have ignored the suggestion without a second thought.
And maybe YouTube has actually been occasionally suggesting that episode of "Find Your Roots" every now and then, and you've been ignoring it without a thought.
I guess what I'm saying is that even if there is zero leak from AntennaPod to YouTube of your behavior, as long as YouTube is collecting and classifying your behavior, and you are the same person choosing what to watch on YouTube and what to listen to on AntennaPod, YouTube may still be able to predict that you're interested in the sort of material that you're listening to on AntennaPod.